Fix all namcap errors. Binary packages are now clean.

Fixing all namcap errors.

gnome-control-center and unity-control-center both user chown 102:0 inside the package function, but all files inside the pkg.tar.xz must be owned by root:root. Therefore I disabled this.

The changes for the install file of gtk3-ubuntu look more complex than they are. I just copied over the install file of the official package and readded your changes. Well, now there's a different intendation.

Another bigger change I did for the unity package. namcap complains about an unsecure rpath. Everything else is self-explanatory.

I left all pkgrels as they were before. I'm not sure which packages you want to force rebuild.

BTW: This pull request replaces #122.