added roi based img normalizer.

deprecated old image normalizer
fixed minor bug in twovaluestocellnodemodel
minor fix in ImgNormalizerNodeFactory
WIP
WIP
First version of ImgNormalizerNodeFactory
added filling methods
fixed enumutils
inverter now works on ROIs
fixed bug in inverter
inverter, thresholder and normalizer with ROI

old implementations are deprecated
added descriptions
added some comments
Merge branch 'master' into roi_nodes

Conflicts:
	org.knime.knip.base/src/org/knime/knip/base/nodes/proc/ImageNormalizerNodeFactory.java
	org.knime.knip.base/src/org/knime/knip/base/nodes/proc/InvertNodeFactory.java
	org.knime.knip.base/src/org/knime/knip/base/nodes/proc/ThresholderNodeFactory2.java
	org.knime.knip.core/src/org/knime/knip/core/util/EnumListProvider.java
	org.knime.knip.core/src/org/knime/knip/core/util/EnumUtils.java
added renamed classes