GriddedLatLonSet

Initial grid guess cannot be missing or invalid -> Exception.
If last found is missing use last valid cell as guess.

disable remove bad lines logic. Enable 'walking over/through' invalid grids points logic. Fix type bug in findValid starting point

Oops, put the main method back the way it was.

Generalizations to facilitate implementing graphics-dependent api

provide a method to override the setting of the mouse motion -> display coordinates translation factor. Remove some very old abandoned code/doc.

make sure to call 'clean' for TrajForm=POINT

Trajectory (minor enhancements)

getStartPointsFromFile: don't initialize start colors unless a scalar tracer value has been specified in the file.