NEWS: prepare for 6.6.6
Task/TaskFileSeeYou: Fix task parser for .cup files

Regression introduced by commit 67d561d1f439097a6a88c4c69324773494951968
OrderedTask: simplify SetActiveTaskPoint()
AbstractTask: force full update after a task edit

Fixes access to uninitialised variables.  Replaces the
active_taks_point_last check.
Geo/UTM: Fixed conversion formula in ToGeoPoint() method

There was a typo in the original formula and the precision
was worse than it could have been.
Merge remote-tracking branch '_max/v6.6.x' into v6.6.x

Conflicts:
	NEWS.txt
Merge pull request #22 from Turbo87/v6.6.x

Updated v6.6.x branch to upstream v6.6.x