Fix typos in doc, comments and messages

• bin/README, bin/common_conv.hh, bin/common_trans.cc, bin/ltlsynt.cc, bin/spot-x.cc, spot/gen/automata.hh, spot/graph/graph.hh, spot/ltsmin/ltsmin.hh, spot/ltsmin/spins_interface.hh, spot/ltsmin/spins_kripke.hh, spot/mc/bloemen.hh, spot/mc/bloemen_ec.hh, spot/mc/cndfs.hh, spot/mc/deadlock.hh, spot/mc/intersect.hh, spot/mc/lpar13.hh, spot/mc/mc_instanciator.hh, spot/misc/bareword.cc, spot/misc/fixpool.hh, spot/misc/formater.hh, spot/misc/minato.hh, spot/misc/satsolver.hh, spot/misc/timer.hh, spot/parseaut/public.hh, spot/priv/partitioned_relabel.cc, spot/priv/satcommon.hh, spot/ta/ta.hh, spot/ta/taexplicit.cc, spot/ta/taproduct.hh, spot/ta/tgta.hh, spot/taalgos/reachiter.hh, spot/taalgos/tgba2ta.hh, spot/tl/apcollect.cc, spot/tl/apcollect.hh, spot/tl/formula.cc, spot/tl/parse.hh, spot/tl/randomltl.hh, spot/tl/relabel.hh, spot/tl/simplify.cc, spot/twa/acc.hh, spot/twa/bddprint.hh, spot/twa/formula2bdd.cc, spot/twa/twa.hh, spot/twa/twagraph.cc, spot/twa/twagraph.hh, spot/twaalgos/aiger.cc, spot/twaalgos/aiger.hh, spot/twaalgos/alternation.hh, spot/twaalgos/cleanacc.cc, spot/twaalgos/cobuchi.cc, spot/twaalgos/contains.cc, spot/twaalgos/couvreurnew.cc, spot/twaalgos/cycles.hh, spot/twaalgos/degen.cc, spot/twaalgos/degen.hh, spot/twaalgos/dot.hh, spot/twaalgos/dtbasat.cc, spot/twaalgos/dtwasat.cc, spot/twaalgos/dtwasat.hh, spot/twaalgos/dualize.cc, spot/twaalgos/emptiness.hh, spot/twaalgos/emptiness_stats.hh, spot/twaalgos/game.cc, spot/twaalgos/genem.hh, spot/twaalgos/hoa.hh, spot/twaalgos/langmap.hh, spot/twaalgos/ltl2tgba_fm.hh, spot/twaalgos/magic.cc, spot/twaalgos/magic.hh, spot/twaalgos/mask.hh, spot/twaalgos/mealy_machine.cc, spot/twaalgos/mealy_machine.hh, spot/twaalgos/minimize.hh, spot/twaalgos/parity.cc, spot/twaalgos/parity.hh, spot/twaalgos/postproc.cc, spot/twaalgos/product.hh, spot/twaalgos/reachiter.hh, spot/twaalgos/relabel.cc, spot/twaalgos/remfin.cc, spot/twaalgos/remfin.hh, spot/twaalgos/sccfilter.cc, spot/twaalgos/sccinfo.hh, spot/twaalgos/se05.cc, spot/twaalgos/se05.hh, spot/twaalgos/simulation.hh, spot/twaalgos/split.hh, spot/twaalgos/stats.hh, spot/twaalgos/synthesis.cc, spot/twaalgos/synthesis.hh, spot/twaalgos/tau03.hh, spot/twaalgos/tau03opt.hh, spot/twaalgos/toparity.hh, spot/twaalgos/totgba.hh, spot/twaalgos/translate.hh, spot/twaalgos/word.cc, spot/twaalgos/word.hh, spot/twaalgos/zlktree.cc, spot/twaalgos/zlktree.hh, spot/twacube/cube.hh, spot/twacube/twacube.hh, tests/core/cube.cc, tests/core/ltlsynt.test, tests/core/parity.cc, tests/core/safra.cc, tests/core/twagraph.cc: here