[pvr.tvh] ignore requests to trigger an EPG update from XBMC is we already 
have an update for that channel queued
[pvr.tvh] don't use the default size of 100 for the HTSP message queue

Should fix recent issues with missing this and that
Merge pull request #39 from Jalle19/fix-queue-size

Increase HTSP queue size
[pvr.tvh] change default connect and response timeout values
[pvr.tvh] remove unused configuration defaults
[pvr.tvh] fix probably copy-paste error which caused the default connect 
and response timeout to default to the same value