Merge pull request #310 from burgerdev/master

Forgot to remove channel axis from region of interest in propogateDirty()
added defaultApplet property to workflow bc to fix #300 and #302
renamed plugins directory. workflow __init__.py checks for plugin system.
plugin directory typo
BatchIo: close the preview before writing or deleting result files (fixes #286 and #287)
hack to ensure checkboxes appear in feature selection dialog.
in carving workflow: disable write-protect if preprocessing is dirty
LayerViewerGui: Fixed accidental commented-out line in setupOutputs()
ilastik.py: debug mode is auto-enabled during recorder playback.
Also, default playback speed is 1.0
workflows: Commented out vigraWatershed import, since it isn't going to be part of the release.
first version of 'labels have changed' dialog
do not print gui-only features in object report
remove entries with missing values from training and prediction. Not removed from labels yet
remove debug prints, move black label to 15 and the color table to objectClassificationGui
set the channel in test treshold
Merge pull request #311 from burgerdev/pr-guimsg

first version of 'labels have changed' dialog
add test features
use volumina capabilities for better data range handling
move channel selection and smoothing into the 5d operator
add one-level threshold and a test