* doc/syntax/mutt.nanorc: Include Benno's awesome signature
matcher, modified slightly to also work for quoted sigs.
* doc/syntax/default.nanorc: Be far more gentle with something
which affects every file which doesn't match another syntax, and
the user may not be able to override if their distro turns on
highlighting by default.\
git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4929 35c25a1d-7b9e-4130-9fde-d3aeb78583b8