Create entries for other figures on _PlotIndex.html even if otherfigure.makefig is None, for adding plots created separately
make otherfigure_dict an OrderedDict (if Python version >= 2.7) so that other figures appear in order specified rather than random order.
Merge pull request #112 from rjleveque/otherfigure_fixes

Otherfigure fixes
don't require exact agreement of times when making plots comparing two sets of results
Merge pull request #113 from rjleveque/time-check

Time checking