logging: set all levels to INFO.
Blockwise Object Classification: Fixed unit test by reducing 'margin' setting.
cleaned up setup.py
stub for manual tracking
added automatic subtracking by overlap
added division handling
extended division handling
fixed deletion of division events, fixed serialization, fixed deletion of track labels
add manual tracking to setup.py

Conflicts:
	setup.py
fixed bugs: double click on division now really points to division, TrackImage is set dirty after label removal
decreased subtracking window size for hufnagel dataset
added layer for untracked objects
divisions checked on startup
handle dirtyness of untrackedImage
manual tracking now updates slicing pos when subtracking ends
do not change slicing pos in z direction
fixed minor bugs
added misdetection button
fixed division button release bug
added export of manual tracking to hdf5 files