unit test for message handling
clarified bad object dict format
OpDataSelection: Forward AllowLabels flag from first inner operator to the multi-lane operator.
Updated pixel classification, carving, object classification and tracking workflows for the multi-lane data selection applet.
broadcast more slots
Merge pull request #349 from burgerdev/pr-oc-testing

Unit Tests for Object Classification Message handling
set() does not support '+'
Merge pull request #352 from burgerdev/microfix

Small fix in error message display of data selection
Adapt synapse object workflowto the data selection applet changes. Adapt blockwise object classification applet to changes in feature selection interface. Correct initialization of some internal varaibles in opObjectClassificaiton.
carving: fix mixed up bright lines, dark lines. fixes #353
Merge branch 'master' of github.com:ilastik/ilastik
carving: fix preprocessing redo bug. fixes #354.
temporarily removed pixel_pitch from 2d distance transform
warnings operator should not send empty warning message during setupOutputs
2D anisotropic distance transform was added to vigra.
DataSelection: Auto-select the appropriate image lane if the user changes the "current view" menu.
Fixes #324
ObjectExtraction: Raise a DatasetConstraintError if the raw image and binary image don't have the same shape.
more debug statements
connect the computed feature names
rewrote gui button logic.