Remove a bashism (pattern substitution in parameter expansion) and use
SRCNAM, instead. Remove unneeded comments. Tweak strip boilerplate.
Incoporate gzip in the sed of the man page and remove useless old-style
man page boilerplate. Make comments clearer. Fix a misaligned ruler in
the slack-desc.
Signed-off-by: Robby Workman <rworkman@slackbuilds.org>