nzbget: Switch from using self-built libpar to generic (un-nzbget-patched) x86_64 version. Relocate libpar package from nzbget plugin directory to /boot/packages. Logic being that up until now, where a package has been specific to a plugin (this) and self-built, keep it under the plugins own location.  Now we're on generic, stick it in with the rest @ /boot.packages. Add check in plugin cleanup to remove old libpar package.  Bump version number to 1.2