[pvr.mythtv] Release v1.9.22

Hi Lars,

Here you will find the set of enhancement and fix for addon pvr.mythtv.

- Fix identifier for DVB-SUBTITLE (broken since Gotham 13.1)
- Add setting to enable or disable EDL functionnality
- Add setting to configure grouping for recordings
- Load EIT categories from customized user file
- Merge channels with same source ID
- Fix codec infos after stream parsing (AAC LATM)
- Fix crash when trying to show recording from unattainable slave backend

Regards