Make fixes for VTK 6

This fixes compilation errors encountered when building PCL
against VTK 6 (from the current git master). The changes are
based on the recommendations in the VTK 6 migration guide [1].

This closes issue #199.

[1] http://www.vtk.org/Wiki/VTK/VTK_6_Migration_Guide
Make fixes for VTK 6

This fixes compilation errors encountered when building PCL
against VTK 6 (from the current git master). The changes are
based on the recommendations in the VTK 6 migration guide [1].

This closes issue #199.

[1] http://www.vtk.org/Wiki/VTK/VTK_6_Migration_Guide
More VTK 6 fixes
Merge remote-tracking branch 'yangyanli/vtk6-fixes-more' into vtk6-fixes

Conflicts:
	visualization/src/image_viewer.cpp
Merge branch 'master' into LarsTest

Conflicts:
	surface/CMakeLists.txt
Updates for VTK6 - avoiding Image_viewer_

LG
To find glu32....
Merge branch 'LarsTest' of https://github.com/larshg/pcl into LGPCLLocal