Navigation: Fix missed import of config

Could lead to GSOD when some plugin puts the box in standby before
Navigation.py was executed.
RecordTimer: Change behavior when recording ends

Only perform actions on the end of an recording when no other recording is
busy or no other recording will be made within 6 minutes.
Optimize some pngs with optipng
Attempt to use the biggest local disk if /hdd/movie does not exist

Hopefully, this makes it possible to use a USB disk or similar.
The whole method of selecting a path has become way too complicated
now, and is a candidate for redesign (without ever using resolvePath
again)

This may lead to unexpectedly recording onto another disk in some
extreme situations though.

But at least it will simply record onto whatever happens to be
handy at the time, which is better than just giving up.
Use previous and next keys to seek to marks while timeshifting.

Signed-off-by: Littlesat <littlesat99@yahoo.com>
Show also timeshift stop warning when previous/next keys are used

Signed-off-by: Littlesat <littlesat99@yahoo.com>
Merge branch 'master' of git://git.code.sf.net/p/openpli/enigma2