fix for manual DVB-T scanning for tuner on position 0

Signed-off-by: Littlesat <littlesat99@yahoo.com>
return empty string instead None for non existing channel

Signed-off-by: Littlesat <littlesat99@yahoo.com>
FastScan: Reload fastscan each 24 hours as long box is in standby
Add timeshift protection to zap to previous service with '0'

Thanks Pr2
http://openpli.org/forums/topic/33259-timeshift-press-0-key-stop-it-immediately-without-any-prompt/
Fastscan: Start fastscan after 90 seconds in standby instead of 10 min

This allows somehowe the fastscan will also be performend for users who
put their settop box when into deepstandby as after a timer recording the box should boot instandby. I had to reduce this time to allow to perform the fastscan after the one minute tune to a channel for getting a correct transponder time
and before the tuning to the channel to record really starts.

Of course some timer recordings are required to allow the auto Fastscan to
be perfrormed. However I suggest most of us will use timer recordings.
Small changes to the VFD display layout of VUDUO2/ET8K/ET10K
Do not show timeshift protection when no services are in the history

Thanks Dima73
http://openpli.org/forums/topic/33259-timeshift-press-0-key-stop-it-immediately-without-any-prompt/
MovieSelection: move selection down when playing next audio file

This will update the front display with the currently played audio file
and also the information on the screen will point to the currently played
audio file

In addition I also remove a line of obsolete code

http://openpli.org/forums/topic/33216-probleem-mediaplayer-openpli-40-dm8000/
NimManager: change default rotorpositions from 49 to 99

As this value might still limit the positioner setup plugin etc.
Thanks Alex_ for reporting
http://openpli.org/forums/topic/33045-geheugenindex-voor-v-box-niet-meer-hoger-dan-49/
NimManager: In the previous commit I forgot to change a config

Sorry...
Small obtimalizations to InfoBarScreenSaver
Add screensaver to MovieSelection for playing MP3s
Solve a debug code I used to test the screensaver
Correctly refocus to next to played service

And correct the focus to the currently played when the screensaver occurs
encoding.conf: add fallback encoding for 'ell' (Greek)

as suggested by malakudi