updated MultidimData to 0.2.1: Fixed some performance issues (nodes were copied twice and modified events were not optimized)
Merge branch 'update-MultidimData' of github.com:SlicerRt/ExtensionsIndex into update-MultidimData

Conflicts:
	MultidimData.s4ext
Merge branch 'master' of github.com:Slicer/ExtensionsIndex into update-MultidimData
ENH: Updated MultidimData for VTK6, real-time plotting added
Merge pull request #732 from SlicerRt/update-MultidimData

Update multidim data