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Add lzma compressor, compressionlevel control at XMLWriter

Quincy Wofford requested to merge qwofford/vtk:add_lzma_compressor into master

  1. Added vtkLZMADataCompressor, which provides better lossless compression ratios compared to existing vtkDataCompressor subclass objects.

  2. Implementing CompressionLevel get/setters at vtkXMLWriter to control tradeoff between compression filesize and compression write performance at a level that is accessible to Python via paraview.simple.

  3. CompressionLevel generalized for vtkDataCompressor type objects. CompressionLevel values from 1 to 9 are valid, where 1 optimizes write performance and 9 optimizes filesize. Since different compressors use "compression level" to affect compression properties differently, each vtkDataCompressor type is implemented to provide a homogeneous interface (ie- CompressionLevel values now affect compressor performance in approximately the same way for all vtkDataCompressor subclass objects)

Edited by Quincy Wofford

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