* src/twaalgos/totgba.hh, src/twaalgos/totgba.cc: Implement
the new function.
* NEWS: Mention this new function.
* src/bin/man/spot-x.x: Document SPOT_STREETT_CONV_MIN.
* src/tests/ltl2dstar4.test: Add tests.
* src/tests/Makefile.am: Add it.
* src/bin/autfilt.cc: Do do call remove_fin explicitely
when --tgba is used, let the postprocessor do it.
* src/twa/acc.hh: Add shift operators for acceptance marks.
* src/twaalgos/remfin.cc: Use the new algorithm.
* src/twaalgos/sccinfo.cc, src/twaalgos/sccinfo.hh: Add
a new method to supply the acceptance sets visited by an SCC.
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