degen: detect superfluous SCCs and remove them
Suggested by Maximilien Colange. * spot/twaalgos/degen.cc: If the output has more SCC than the input, detect useless SCCs and remove them. * spot/twaalgos/postproc.cc, spot/twaalgos/postproc.hh, spot/twaalgos/degen.hh: Add support for a degen-remscc option. * bin/spot-x.cc, NEWS: Document it. * tests/core/degenscc.test: New file. * tests/Makefile.am: Add it. * tests/core/det.test: Lower some expected size (yay!).
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