* src/ltlvisit/tostring.hh (to_string): Add doxygen comments.
* src/ltlast/multop.hh (multop::paircmp): Add doxygen comments.
* src/ltlvisit/postfix.hh: Typo.

(libltlast_la_SOURCES): Move all headers to ltlast_HEADERS.
* src/ltlenv/Makefile.am (ltlenvdir, ltlenv_HEADERS): New variables.
(libltlenv_la_SOURCES): Move all headers to ltlenv_HEADERS.
* src/ltlparse/Makefile.am (ltlparsedir, ltlparse_HEADERS): New
variables.
(libltlparse_la_SOURCES): Move all public headers to ltlparse_HEADERS.
* src/ltlvisit/Makefile.am (ltlvisitdir, ltlvisit_HEADERS): New
variables.
(libltlvisit_la_SOURCES): Move all headers to ltlparse_HEADERS.
* src/misc/Makefile.am (include_HEADERS): Rename as ..
(misc_HEADERS): ... this.
(miscdir): New variable.
* src/tgba/Makefile.am (tgbadir, tgba_HEADERS): New variables.
(libtgba_la_SOURCES): Move all headers to tgba_HEADERS.
* src/tgbaalgos/Makefile.am (tgbaalgosdir, tgbaalgos_HEADERS):
New variables.
(libtgbaalgos_la_SOURCES): Move all headers to tgbaalgos_HEADERS.
* src/tgbaparse/Makefile.am (tgbaparsedir, tgbaparse_HEADERS): New
variables.
(libtgbaparse_la_SOURCES): Move all public headers to
tgbaparse_HEADERS.
* src/tgbaparse/public.hh: Include ltlparse/location.hh, not
location.hh.

with STL.
* src/ltlast/atomic_prop.cc, src/ltlvisit/lunabbrev.cc,
src/ltlvisit/nenoform.cc: Include <cassert>.

equal visitor useless, since two equals formulae will now
share the same address.

* src/ltlast/multop.hh (add_sorted): New function.
(paircmp): New comparison functor.
(map): Use paircmp, we want to compare the vectors' contents,
not their addresses.
* src/ltlast/multop.cc (add_sorted): New function.
(add): Use it.
* src/ltltest/equals.cc, src/ltltest/tostring.cc: Compare
pointers instead of calling equal.
* src/ltlvisit/equals.cc, src/ltlvisit/equals.hh: Delete.
* src/ltlvisit/Makefile.am (libltlvisit_la_SOURCES): Remove
equals.cc and equals.hh.
* wrap/spot.i: Do not include equals.hh.

* src/ltlast/atomic_prop.hh: Declare instance_count().
* src/ltlast/binop.hh, src/ltlast/unop.hh, src/ltlast/multop.hh:
Likewise.  Also, really inherit for ref_formula this time.
* src/ltlast/atomic_prop.cc, src/ltlast/binop.cc,
src/ltlast/unop.cc, src/ltlast/multop.cc: On destruction, suppress
the instance from the instance map.  Implement instance_count().
* src/ltlast/formula.cc, src/ltlast/formula.hh,
src/ltlast/ref_formula.cc, src/ltlast/ref_formula.hh: Add virtual
destructors.
* src/ltlparse/ltlparse.yy: Recover from binary operators with
missing right hand operand (the point is just to destroy the
the left hand operand).
* src/ltltest/equals.cc, src/ltltest/readltl.cc,
src/ltltest/tostring.cc: Destroy used formulae.  Make sure
instance_count()s are null are the end.
* src/ltltest/parseerr.test: Adjust expected result, now
that the parser lnows about missing right hand operands.
* src/ltlvisit/destroy.hh, src/ltlvisit/destroy.cc,
src/ltlvisit/postfix.hh, src/ltlvisit/postfix.cc: New files.
* src/ltlvisit/Makefile.am (libltlvisit_la_SOURCES): Add them.
* src/ltlvisit/lunabbrev.cc (Xor, Equiv): Clone formulae
occurring twice in the rewritten expression.

reference-counted formula*.  One can't call constructors for AST
items anymore, everything need to be acquired through instance()
class methods.

* src/ltlast/formula.cc, src/ltlast/refformula.cc,
src/ltlast/refformula.hh: New files.
* src/ltlast/Makefile.am (libltlast_la_SOURCES): Add them.
* src/ltlast/atomic_prop.cc, src/ltlast/atomic_prop.hh,
src/ltlast/unop.cc, src/ltlast/unop.hh,
src/ltlast/binop.cc, src/ltlast/binop.hh: Make the constructor
and destructor protected.  Define a static function `instance()'
to get an instance with specific argument.  Use a map called
`instances' to store all known instances.  Inherit from
ref_formula.
* src/ltlast/constant.hh, src/ltlast/constant.cc: Protect
the constructor and destructor.  Provide the false_instance()
and true_instance() functions instead.
* src/formula.hh (ref, unref, ref_, unref_): New methods.
* src/ltlast/multop.cc, src/ltlast/multop.hh: Protect
the constructor, destructor, as well as the add() method.
Provides the instance(), and add() class methods instead.
Store children_ as a pointer.
* src/ltlenv/defaultenv.cc (require): Adjust to
call atomic_prop::instance.
* src/ltlparse/ltlparse.yy: Adjust to call instance() functions
instead of constructors.
* src/ltltest/Makefile.am (LDADD): Tweak library ordering.
* src/ltlvisit/clone.hh (clone_visitor): Inherit from visitor,
not const_visitor, and adjust all prototypes appropriately.
* src/ltlvisit/clone.cc (clone_visitor): Likewise.
Call ref() or instance() methods instead of copy constructors.
* src/ltlvisit/equals.cc: Simplify atomic_prop and constant
cases.
* src/ltlvisit/lunabbrev.hh, src/ltlvisit/lunabbrev.cc,
src/ltlvisit/tunabbrev.hh, src/ltlvisit/tunabbrev.cc,
src/ltlvisit/nenoform.hh, src/ltlvisit/nenoform.cc: Use instance()
methods instead of constructor.  Make these children of visitor, not
const_visitor.
* src/ltltest/readltl.c (main): Do not delete the formula.

(noinst_LTLIBRARIES): ... this.
* src/ltlenv/Makefile.am, src/ltlast/Makefile.am,
src/ltlparse/Makefile.am: Likewise.
* src/Makefile.am (lib_LTLIBRARIES, libspot_la_SOURCES,
libspot_la_LIBADD): New variable.   Build a libspot.la library
from all the sub-libraries.

* Makefile.am (SUBDIRS): Add wrap.
* wrap/Makefile.am: New file.
* wrap/spot.i: New file.  Preliminary bindings for Python.
* configure.ac: Call adl_CHECK_PYTHON and output wrap/Makefile.

* src/ltlast/Makefile.am, src/ltlenv/Makefile.am,
src/ltlparse/Makefile.am, src/ltltest/Makefile.am,
src/ltlvisit/Makefile.am: Adust to build libtool libraries.

* src/ltlast/Makefile.am (libltlast_a_SOURCES): Add visitor.hh.

src/ltlast/constant.hh, src/ltlast/formula.hh,
src/ltlast/multop.hh, src/ltlast/unop.hh, src/ltlast/visitor.hh,
src/ltlenv/defaultenv.hh, src/ltlenv/environment.hh,
src/ltlparse/public.hh, src/ltlvisit/clone.hh,
src/ltlvisit/dotty.hh, src/ltlvisit/dump.hh,
src/ltlvisit/equals.hh, src/ltlvisit/lunabbrev.hh,
src/ltlvisit/nenoform.hh, src/ltlvisit/tunabbrev.hh: Add
Doxygen comments.
* src/visitor.hh: Do not use const_sel.  This clarify
the code and helps Doxygen.

an atomic_prop.
* src/ltlast/atomic_prop.hh (atomic_prop): New argument env.
(environment_): New member.
(env): New method.
* src/ltlast/atomic_prop.cc (atomic_prop, env): Likewise.
* src/ltlenv/defaultenv.cc (require): Pass *this as the
environment argument to atomic_prop.
* src/ltlvisit/clone.cc (visit(const atomic_prop*)): Also copy
the environment.
* src/ltlvisit/nenoform.cc (visit(const atomic_prop*)): Likewise.

* src/ltlvisit/Makefile.am (libltlvisit_a_SOURCES): Add them.
* src/ltlast/multop.cc (multop::multop(type)): New constructor.
* src/ltlast/multop.hh (multop::multop(type)): New constructor.
* src/ltltest/lunabbrev.test: New file.
* src/ltltest/Makefile.am (TESTS): Add lunabbrev.test.
(check_PROGRAMS): Add lunabbrev.
(lunabbrev_SOURCES, lunabbrev_CPPFLAGS): New variables.
* src/ltltest/equals.cc (main) [LUNABBREV]: Call unabbreviate_logic.

* src/ltlast/formula.hh: ... this.
* src/ltlast/Makefile.am (libltlast_a_SOURCES): Adjust.
* src/ltlast/formula.hh (formulae): Rename as ...
(formula): ... this.
Adjust all uses.

(multop::add): If the formulae we add is itself a multop for the
same operator, merge its children with ours.
* src/ltltest/parseerr.test: Add two tests for multop merging.

* src/ltlast/unop.hh (unop::equals): Remove.
* src/ltlast/unop.cc (unop::equals): Remove.
* src/ltlast/binop.hh (binop::equals): Remove.
* src/ltlast/binop.cc (binop::equals): Remove.
* src/ltlast/multop.hh (multop::equals): Remove.
* src/ltlast/multop.cc (multop::equals): Remove.
* src/ltlast/atomic_prop.hh (atomic_prop::equals): Remove.
* src/ltlast/atomic_prop.cc (atomic_prop::equals): Remove.
* src/ltlast/constant.hh (constant::equals): Remove.
* src/ltlast/constant.cc (constant::equals): Remove.

src/Makefile.am, src/ltlast/Makefile.am, src/ltlast/allnodes.hh,
src/ltlast/atomic_prop.cc, src/ltlast/atomic_prop.hh,
src/ltlast/binop.cc, src/ltlast/binop.hh, src/ltlast/constant.cc,
src/ltlast/constant.hh, src/ltlast/formulae.hh,
src/ltlast/multop.cc, src/ltlast/multop.hh, src/ltlast/predecl.hh,
src/ltlast/unop.cc, src/ltlast/unop.hh, src/ltlast/visitor.hh,
src/ltlparse/Makefile.am, src/ltlparse/ltlparse.yy,
src/ltlparse/ltlscan.ll, src/ltlparse/parsedecl.hh,
src/ltlparse/public.hh, src/ltlvisit/Makefile.am,
src/ltlvisit/dotty.cc, src/ltlvisit/dotty.hh,
src/ltlvisit/dump.cc, src/ltlvisit/dump.hh,
src/ltlvisit/rewrite.cc, src/ltlvisit/rewrite.hh,
src/ltltest/Makefile.am, src/ltltest/defs.in, src/ltltest/readltl.cc,
src/ltltest/parse.test, src/ltltest/parseerr.test,
src/misc/Makefile.am, src/misc/const_sel.hh: New files.