Prevent navobj backup rotation in case there are no changes. This should protect the user from overwriting all his good backups while trying to 'fix' some problem using infinite reinstalls and restarts.
Decouple touch screen interface from responsive graphics element.
Merge conflicts
Correct magnetic variation correction logic for $xxAPB output sentence.
Merge remote-tracking branch 'upstream/master' into optimum

Conflicts:
	src/navutil.cpp