Fixed "debian/rules"
Few fixes

14:11:01 <zigo> Please don't use a different license for what's in debian/* folder.

14:12:05 <zigo> For your man page, please use debian/symlookup.manpages, not debian/symlookup.install
14:12:51 <zigo> The package should build-depend on gawk.
Fixed the manpage path, and filtered docs
Merge branch 'debian' of https://github.com/xaionaro/symlookup into debian