- make version highlight less blindly greedy and conform to real versions
- move version matching before USE matching to avoid hitting USE flags
  that look like versions
- change USE regex to match the Gentoo PMS
- extend arch match to include more keywords
- make category matching more restrictive to avoid false positives
- drop operators =< and => that Gentoo doesn't support

URL: https://savannah.gnu.org/bugs/?49569

Reported-by: Konstantin Shakhnov <kastian@mail.ru>

This allows for commenting or uncommenting a line or a bunch of lines
with a single keystroke (default binding: M-3).  The characters used
for commenting/uncommenting are specified by the active syntax file.
Reviewed-by: Benno Schulenberg <bensberg@justemail.net>
Signed-off-by: Mike Scalora <mike@scalora.org>

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4899 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4668 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4616 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4598 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

        * doc/syntax/gentoo.nanorc: Tweak comment highlighting.



git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4438 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

	* doc/syntax/(gentoo|sh|tcl).nanorc: Fix problems with empty regexes on POSIX.
	  Fixes Savannah bug 27175.



git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4403 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

        * doc/syntax/gentoo.nanorc: Updates from David and Mike Frysinger.



git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4355 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4242 35c25a1d-7b9e-4130-9fde-d3aeb78583b8