Make "Add Available Shows to Queue" catch up with previous episodes
ITV/4oD: Copy programme description to long description and lyrics tags
4oD: Fixed bug that prevented programme description being saved to cache
4oD: Use full programme description instead of truncated synopsis
4oD: Fixed bug that prevented pvr matches being added to queue
Fixed bug that permitted non-Series-Link entries to be hidden in queue

Only Series-Link can now be hidden (added to download history).  Ad hoc
entries are ignored if selected.  Button text has been changed to
"Permanently Skip Selected Series-Link Entries" to better reflect its
associated function.
ITV: Increased thumbnail size to 640x360
ITV: Reformatted rtmpdump args
Fixed bug that permitted series-link entries to be queued multiple times
Version 1.5.1+dp.1
Merge branch 'release/1.5.1+dp.1'