make ctrl-c work
remove obsolete comment
add minimalistic logging "framework" (method)
process image comment
better logging of errors with single image
better progress logging
also ignore manually copied image dirs
allow JSON writeout of partial results, (prepare) improved stat logs
WIP heuristic gps
WIP show comments on page
Merge branch 'master' of github.com:mnagel/gpsplot

Conflicts:
	preproc.py
whitespace fixup