Revision 442113

Fix help menu which currently tries to open help files from
share/sane/xsane/doc instead of share/doc/xsane where they are
installed.

While here

- Add LICENSE_FILE
- Pet portlint: regenerate and rename patches
- Switch GIMP option to options helpers
- Fix pkg-message.  The GIMP plugin now shows up in File->Create and
  not in File->Acquire.

PR:		218989
Approved by:	lme (mentor), koalative@gmail.com (maintainer timeout, 4 weeks)
Differential Revision:	https://reviews.freebsd.org/D10752