[vtkusers] make install problem and the .cxx in CMakeLists.txt files

[Hua Qian]

I have trouble with 'make install' for cvs version of
VTK recently. It tries to install vtk*.cxx.h files.

It seems that the problem is from the CMakeLists.txt files.
For example, VTK/Common/CMakeLists.txt should read

SET( Common_SRC
vtkAbstractMapper
vtkAbstractTransform
...

instead of

SET ( Common_SRC
vtkAbstractMapper.cxx
vtkAbstractTransform.cxx
...

Hua