Rename numberZap to numberSelection in ChannelSelection

As this better covers what it exactly is doing.
Dish: Commit fix for mistake from previous Dish.py patch

see: http://openpli.org/forums/topic/34648-dishpy/
As suggested by Dima73
Merge branch 'master' of git://git.code.sf.net/p/openpli/enigma2 into BETA