Safra: Fix usage of multiple acceptance conditions and fix text output.
* src/tgba/tgbasafracomplement.cc (tgba_safra_complement::tgba_safra_complement) (tgba_safra_complement::succ_iter): Correct the declaration and use of multiple acceptance conditions. (state_complement::to_string): Output the L set, not U. The previous code caused different states to share the same names, causing issues with the text-based output (state with identical names get merged). * src/tgba/tgbasafracomplement.hh (tgba_safra_complement::acceptance_cond_vec_): Adjust type to store BDDs. * src/tgbatest/complementation.cc: Implement a new "-b" option to output automata in Spot's syntax. * src/tgbatest/complementation.test: Add a test-case supplied by Martin Dieguez Lodeiro. * THANKS: Add Martin.
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