New AlertDialogFragment.java introduced
GuidedModeWarning: Dialog added, just an idea for review. No altitude to enter as requested.
GuidedWarnGuidedModeWarning: we have to make some check for sure ...
GUIDED: Added a dialog for Guided mode, and changed the way guided is handled.

Now GUIDED works more like a State Machine, with safetys to prevent incorrect operation.
GUIDED: Making the guided marker work again as expected.
Merge pull request #595 from arthurbenemann/GuidedOnLongPress

Guided on long press