improvements in Debian packaging
make notepadqq-gtk depend on 'notepadqq (= ${binary:Version})'
simplify Debian packaging
install notepadqq-gtk.sh in /usr/lib/notepadqq
install notepadqq.sh in /usr/lib/notepadqq
Update notepadqq-gtk.sh
Merge pull request #26 from darealshinji/master

improvements in Debian packaging