unified node and category icons
unified category and node icons
interactive segmentation view partial working
Merge branch 'master' into providerRewrite
icon to splash screen added
fixed a bug renderer is now selected automatically interactive segmentation... seems to work
accidentally missing icons now added
overlayProvider to RU first draft
added hashcode comparrissons for fast rendering
removed storing of used renderers because some renderers have no empty constructor
provider rewrite: histogram is working again
provider rewrite: readded labeling to table cell viewer
Merge branch 'master' into providerRewrite
provider rewrite: renamed CommonViewRU -> AbstractDefaultRU
provider Rewrite: got threhsold provider working again
Merge branch 'master' into providerRewrite
provider Rewrite: transfer functions are working again
provider Rewrite: documentation update
providerRewrite: small onClose cleanup still maintaining writing of some values ...
providerRewrite:  removed state storing and extended cleanup on view close

removed state saving/loading (didn't work reliably either
This may be due to the difficulties in actually using the methods (node views have unreliable access to config options.) Now there is no bookkeeping after a view is closed, which means less nice behaviour for the user but mor consistent behaviour and cleaning up the sotrage by nulling references is much easier and more reliable.