LZMA compressor. vtkXMLWriter features. vtkDataCompressor level set/get.
1.) LZMA compressor added.
2.) Compression level getters/setters are now required by vtkDataCompressor objects; level setting behavior is now homogeneous for all vtkDataCompressor objects (CompressionLevel value 1 is faster encoding/larger files, 9 is slower encoding/smaller files)
3.) vtkXMLWriter objects can configure vtkDataCompressor levels, but they are not required to set them.
Edited by Quincy Wofford