Fix: Searching for propers/repacks at nzbs.org.

If no results are found with the usual search URL, an alternate is tried.
Merge pull request #573 from JackDandy/FixSearchNzbsOrg

Fix: Searching for propers/repacks at nzbs.org.
Fixed find propers.
Added ability to force a find propers search.
Fxi for failed downloads
This fixes all failed download issues