Reconfiguring commercial skip recordedseek table searching
Reconfiguring the DB seek using janbar's cmyth_mysql_get_recording_seek_offset as a starting point.

References:
https://github.com/fetzerch/xbmc-pvr-addons/commit/97f2ea56e2b2bb4dee50d36f9a0d34165dbce5bb
https://github.com/fetzerch/xbmc-pvr-addons/commit/24229dcd4feb6fd893cd17230408bd0625117671

Checks dbScheme for version 1309 or higher before running these queries.

Removed MythDatabase::GetPositionMapByMark and cmyth_mysql_get_position_map_by_mark

Added cmyth_mysql_get_recording_seek_offset and overloaded MythDatabase::GetRecordingSeekOffset