* configure.ac: Test for <spawn.h>.
* bin/common_trans.cc: Use posix_spawn when available.
* NEWS: Mention the change.
* tests/core/ltldo.test: Adjust expected error message.
* bin/common_conv.cc, bin/common_conv.hh: Here.
* bin/autfilt.cc, bin/common_trans.cc, bin/ltlcross.cc, bin/ltldo.cc,
bin/ltlfilt.cc, bin/ltlgrind.cc, bin/randaut.cc, bin/randltl.cc: Pass
the name of the argumennt to the conversion function.
* tests/core/ltlcross3.test, tests/core/ltldo.test,
tests/core/randaut.test: Add test cases.
Suggested by Tobias Meggendorfer. Fixes#295.
* bin/ltlcross.cc, bin/common_trans.hh, bin/common_trans.cc: Implement
this --reference option.
* NEWS, doc/org/ltlcross.org: Document it.
* tests/core/ltlcross3.test: Test it.
* bin/common_trans.cc, bin/common_trans.hh, bin/ltlcross.cc,
bin/ltldo.cc: Rename translator_spec and translators to tool_spec and
tools, so that we can reuse these structures for automata tools
in a future autcross.
* bin/common_trans.cc, bin/common_trans.hh: Add the --relabel option.
* bin/ltlcross.cc, bin/ltldo.cc: Implement it.
* doc/org/ltldo.org, NEWS: Document it.
* tests/core/ltl3ba.test: Test it.
For #192.
* bin/common_trans.cc, bin/common_trans.hh, spot/twa/acc.hh:
Add an operator= in addition to the copy constructor.
* spot/twaalgos/ltl2tgba_fm.cc: Use the default constructor.
* spot/ta/taproduct.cc, spot/ta/taproduct.hh: Delete an unused copy
constructor.
Part of #168.
* spot/misc/formater.cc: Adjust to support bracketed options.
* bin/common_trans.hh, bin/common_trans.cc: Use that to
support rewriting operators.
* doc/org/ltlcross.org, tests/core/ltldo.test: Add some examples.
* NEWS: Mention it.
