* src/bin/common_output.cc: Add option --format and implement
it.
* src/bin/ltlfilt.cc, src/bin/randltl.cc: Document the
supported %-sequences.
* src/bin/genltl.cc: Document the %-sequences, and supply
the name of the pattern to output_formula().
* doc/org/genltl.org, doc/org/ioltl.org, doc/org/ltlfilt.org,
NEWS: Document it.
* src/ltltest/latex.test: Use it.
* doc/org/ioltl.org: Mention ltl2dstar and the changes to the prefix
parser.
* doc/org/ltlcross.org: Mention bench/ltl2tgba/sum.py.
* doc/org/tools.org: Bump version number.