[mythtvnz] Prime => Sky Open

[Stephen Worthington]

The renaming of Prime has happened on DVB-T, DVB-S and DVB-S2.  The
only change is the name, all other settings remain the same:

"Prime" => "Sky Open"
"Prime HD" => "Sky Open"
"Prime +1" => "Sky Open +1"

The channel table "name", "callsign", "xmltvid" and "icon" fields need
to be updated, and the record table "station" field.

New icons can be downloaded from here:

http://freeviewnz.tv/nonumbracoimages/ChannelsOpg/SkyOpenlogo_RGB_1280X1280.jpg
http://freeviewnz.tv/nonumbracoimages/ChannelsOpg/SkyOpen_Pluslogo_RGB_1280X1280.jpg

Note that rescanning will change the channel table fields, but will
not change the record.station field to match, so all the recording
rules that use the "station" value will still need to be manually
changed.  I am just manually editing the channels in mythtv-setup >
Channel Editor and then using SQL to change the record.station values
to match.  For example (it may not exactly match your database):

select recordid,chanid,station,title from record where station like
'%prime%';

update record set station='Sky Open' where station='PRIME';

After making a change like that, restart mythbackend.  Then re-fetch
your EPG data so it will match the changed database.