A lot of cleanups.  Client concrete classes in mlc are now all
postfixed by '_'.  For instance, we have and_, int_, and so on.

- metalic: New.
- metalic/mlc: New.
- metalic/mlc/type.hh: New.
- metalic/mlc/bool.hh: New.
(abstract::boolean): New class.
(bool_): New class.
(value, true_type, false_type): Rename as...
(value_, true_, false_): ...these.
(ors, ands): Rename as...
(ors_, ands_): ...these.
(internal): Cosmetic change.
(is_true, is_false): Remove.
(true_, false_): New typedef ensure_t.
- metalic/mlc/is_a.hh: New.
(form): Move in the internal namespace cause names are too long
for a decent client use.
- metalic/mlc/value.hh: New.
(value): Rename as...
(value_): ...this.
(mlc_internal_decl_unsigned_): New macro.
(mlc_internal_decl_signed_): New macro.
(uchar_, ushort_, uint_, ulong_): New classes.
(schar_, short_, int_, long_): New classes.
(is_value, is_not_value): New meta-functions.
- metalic/mlc/flags.hh: New.
(flag): New abstract class.
(undefined_type, unknown_type, no_type): Rename as...
(undefined, unknown, none): ...these.
(not_ok): Remove cause useless.
- metalic/mlc/cmp.hh: New.
(eq, neq): Rename as...
(eq_, neq_): ...these.
(is_found, is_not_found, is_ok): Remove cause irrelevant here.
(mlc_is_found, mlc_is_not_found): Likewise.
- metalic/mlc/typedef.hh: New.


git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@384 4aad255d-cdde-0310-9447-f3009e2ae8c0