trap NPE when trying to redraw range plot and we haven't yet generated a solution (so the relevant track is actually empty)
trim the plot time period to the minimum of the time slider bars and the length of the primary track
show useful warning message when trying to produce a plot but the primary track is empty.
trap NPE when retrieving start/end times for a solution that hasn't been generated yet.
just white space reformatting
FIX: if the state matches the time we use it, not just if it's after the time
make the interpolation calculator more flexible
spread the ability to interpolate fixes a little wider
spread the ability to interpolate fixes a little wider
introduce ability for SATC solution to interpolate points in getNearest() - particularly relevant relative XY plots during sparse alterations.
make point interpolation apply to wider set of classes (ISecondaryTrack, not just TrackWrapper)
Merge pull request #893 from debrief/881_scenario_track

881 fixes for displaying SATC Scenario in relative plot