To avoid a error window from VTK due to the txtactor having no scalars.
Merge pull request #823 from larshg/FixNoScalarValues

To avoid a error window from VTK (6) due to the txtactor having no scalars.
Move USE_PROJECT_FOLDERS to pcl_options.cmake
Move BUILD_tools to pcl_options.cmake and enable it again
Remove duplicate uninstall message
Don't install correspondence.h twice
Fix initialization order in openni_grabber.cpp