capmt: adjust for recent OSCam frame change

Additional byte describing adapter index was
added to the beginning of the frame.
It only affect tvh capmt mode 2.
support: add basic IPTV migration to conf_migrate script
iptv: stop possible crash on IPTV mux tune failure
Merge remote-tracking branch 'origin/pr/311'
capmt: attempt to avoid confusion over validity of configuration

UI now has 3 possible colours, red - not working, orange - not connected
(but will probably work, used for new non-persistent mode 2) and green -
actively connected.
capmt: fix silly error in capmt record building with new connected field
add option to only allow user to access the tag that matches username