fix yet another bug in the multithreading. Use axistags
interpolate partially black objects
don't compute histogram, brings nothing
ObjectExtraction: config: Added RegionCenter to vigra features.
OpObjectExtraction: Added an output for RegionFeatures with rtype=ArrayLike
Blockwise Object Classification: Added an output slot for region features.
cluster: Added option for 'secondary' output results.
workflow: Eliminated an obsolete function.
Two-level thresholding: Save cached output to the project file.
Fixed bugs in the threshold-two-level and blockwise object classification guis that prevented you from applying several new settings at once.