the existing -q/--quiet option is renamed to --ignore-errors
* src/bin/ltlfilt.cc: Adjust option.
* src/bin/common_output.cc, src/bin/common_output.hh: Add a
quiet_output.
* bench/dtgbasat/prepare.sh: Rename -q to --ignore-errors..
* src/ltltest/remove_x.test: Use -q.
* NEWS: Mention this change.
* src/tgbaalgos/dtbasat.cc, src/tgbaalgos/dtgbasat.cc: Record
statistics about intermediate automata if SPOT_SATLOG is set to some
filename, and display intermediate automata if SPOT_SATSHOW is set.
* bench/dtgbasat/stat.sh, bench/dtgbasat/stats.sh,
bench/dtgbasat/tabl.pl, bench/dtgbasat/tabl1.pl,
bench/dtgbasat/tabl2.pl, bench/dtgbasat/tabl3.pl,
bench/dtgbasat/tabl4.pl: Gather these extra statistics.