v1.2.0

New Features for v1.2.0:

• Added a new data filter: VoxelGrid
• Added support for PCL (Point Cloud Library) data format: PCD
• Improved *.vtk legacy format to handle UNSTRUCTURED_GRID format
• New ErrorMinimizer producing covariance matrix
• Better user documentation and tutorials
• Avoids point cloud copies when filtering
• Added CMake support for find_package
• Added support for PLY (Polygon File Format or the Stanford Triangle Format) for ascii encoding
• Improved CSV file support with import/export of selected descriptors