better layout
layout, removed Debian/Ubuntu taglib instruction

...since on Debian-based systems build.sh now adds `ac_add_options --with-taglib-source=packaged` automatically to nightingale.config
simplify & clean up code, add xz compression
remove executable bit from files, which aren't supposed to be executable
fix file permissions in Makefile instead of debian/rules
Merge pull request #296 from darealshinji/sb-trunk-oldxul

Better fix for executable bits, improved manpage and simplified debian/rules.