provider Rewrite: changed the overlay renderer such that it includes an ImageRenderer beneath that allows to skip the blending step if the overlays get rendered directly on top of the image which is faster
Feature set ID added to the FeatureSetProviders (allows renaming and therewith a basic machanism for deprecation)
introduced CombinedRU that handels multiple RUs and renders their images together by simple blending (WHITE = transparent). This replaces the same functionality in the AWTImageProvider, that from now only takes one RenderUnit (which may be a combined one). Also changed the OverlayRU to accept other background renderers as well
Revised Shape Descriptors Feature Set:
- FDComplexCentralDistance removed
- Approximated distances (polar images) replaced by calculating the distance on the orginal contour points determined by tracing the contour
- option to specify the number of bins removed, as it probably doesn't makes sense (?)
Merge branch 'master' of https://github.com/knime-ip/knip
using knime memory warning system
FeatureSetDialogComponentCollectoin made public again as needed by org.knime.suise
Merge branch 'master' of https://github.com/knime-ip/knip
Fixed bug introduced with recent commit 88213ee6ee48c7b114ed1396e4112004e7e5f4e4
Added update and feature
Merge branch 'master' of https://github.com/knime-ip/knip
included RenderUnits listen also to AnnotatorReset as trigger for nulling of hold references
Merge branch 'master' into EditAnnotaor

Conflicts:
	org.knime.knip.core/src/org/knime/knip/core/ui/imgviewer/panels/providers/CombinedRU.java
	org.knime.knip.core/src/org/knime/knip/core/ui/imgviewer/panels/providers/ImageRU.java
	org.knime.knip.core/src/org/knime/knip/core/ui/imgviewer/panels/providers/OverlayRU.java
cleaning up merge artefacts