minor text and rocket track stuff
fix for input alts=[] (which evaluated to false, and [250, 500] was used instead)
added graceful failing to parse png filenames in plot folder when guessing startAt
corrected bug where cardinal directions weren't plotted on all plots
Merge branch 'master' into CAPER
updated title font sizes
removed unit 'km' from flat plot altitude line labels and changed label spacing
Merge branch 'master' into CAPER

Conflicts:
	eiscatscanplot.py