Timeshift improvments

- Use previous and next keys to seek to marks while timeshifting.
- Show also timeshift stop warning when previous/next keys are used

Signed-off-by: Littlesat <littlesat99@yahoo.com>
eDVBServicePMTHandler: add getAITApplications
python_service.i: naming change getAITApplication -> getAITApplications

optimization size() -> !empty()
Use a wasInDeepstandby flag for timerhandling

This allow more time to retreive a receiver time and reduces a chance that
a recording was missed. Probably I can later remove the 30 sec delay
completely

In addition add some recommendations from Dima73 - but a bit different
Add activity detection between deepstandby and recording start
Fix for service scan via satfind when tuner A is not used
Navigation: Remove the 30 second timer when wakeup from deepstandby
Move resetting the standby counter to RecordTimer.py
Merge branch 'master' of git://git.code.sf.net/p/openpli/enigma2