german manual: corrections to chapter 8.added pictures for easy access master-slave modei, updated buttons.
Manual de/ch13_history.tex: Mostly typos and corrections.
Merge remote-tracking branches 'adrien/master' and 'hjr/master'
Manual icons: Added the bridge map icon.
Manual: Updated all button menu references.
Manual configuration.tex: Correct default shading.
Device/Driver/BlueFlyVario: support battery status.
InfoBoxes/Content: show battery level of external device in comment field.
Manual figures: Some de translated figures.
Manual(s): Fixed undefined and wrong references.
Merge remote-tracking branches 'hjr/master' and 'tjeerdm/master'
vlconv: Missed one call of mktime()

Missed to reenable one call of mktime.
Compare with commit:
Volkslogger: vlconv reenable mktime()
MapSettings: Changed default orientation to "North up"
MapProfile: Only set orientations if a value was loaded

This overwrote the defaults in the MapSettings struct
MapSettings: Initialize map_shift_bias attribute
po: update German translation
po: update French translation
Dialogs/TrafficList: make the ActionListener mandatory

We'll need it soon.
Dialogs/TrafficList: add "Map" button
MapItem: move to MapWindow/Items/