[pvr.tvh] compare tags before triggering an update
[pvr.tvh] fix locking mistake not spotted in previous PR
[pvr.tvh] - bump version to 0.9.1
[pvr.tvh] - further minor correction / improvement to async waiting
Merge remote-tracking branch 'origin/pr/44'
[pvr.tvh] remove non-existing field "subtitle" from events
[pvr.tvh] remove unnecessary call to SEvent.Clear()

Already done in the constructor.