added h5 clean-up for failed loadProject() calls
tests: Fixed two object classification tests.
updated chaingraph import warning
add license files
fix #813
Merge pull request #771 from burgerdev/vanishing-files

added h5 clean-up for failed loadProject() calls
Compute features only for images and time steps with labels
make the background label slot optional. now we can actually call setupOutputs of opObjectExtraction and compute object centers blockwise
opThresholdTwoLevels.OpSelectLabels: Added an assert.
Shell: Applet Drawer is now a special subclass of QToolBox which can truly hide entries without changing the index of the other entries.
Applets can be marked as not "interactive" in their constructors to indicate that they should not be shown.
StandardApplet: Fixed __init__ argument list.