[mythtvnz] tv_grab_nz-py - HDHomeRun and 0.21

[Tortise]

Have made some progress.  The issue may have been that there were triplicate lines of all the channels in /mythweb/settings under 
"Channel Info" tab.

Deleting some of the channels that did not have xmltvid's and/or adding these in seems to have fixed the named src icons that are 
now appearing.

Also seems callsigns for same channels in multiple tuner configs need same data otherwise two lines get generated.

Curiously when a channel was not entered correctly the now/next EIT data still came through.

LiveTV still has some issues....