ENH: Fixes for ActiViz.Net

Added wrapping hint for vtkAMRVolumeMapper
Fixing TCL test so that automatic wrapping generator for ActiViz works
Added WRAP_GCCXML definition to expose arrays' methods to ActiViz

Change-Id: Iebed9df18073e9d546ed7ebc9a8b3d43bc7da3cb
Merge topic 'ActiViz' into master

a2dea46c ENH: Fixes for ActiViz.Net