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 * Jmol RCSB MMTF (macromolecular transmission format) file reader
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 * see https://github.com/rcsb/mmtf/blob/master/spec.md
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 * /full/ specification as of 2016.4.18 is implemented,including:
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 * reading atoms, bonds, and DSSR secondary structure
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 *   load =1f88.mmtf;cartoons only;color structure 
 *   
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 * reading space groups and unit cells, and using those as per other readers
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 *   load =1crn.mmtf {1 1 1};unitcell 
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 * reading bioassemblies (biomolecules) and applying those transformations
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 *   load =1auy.mmtf FILTER "biomolecule 1;*.CA,*.P"
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 * reading biomolecules and lattices, and loading course-grained
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 *   load =1auy.mmtf {2 2 1} filter "biomolecule 1;bychain";spacefill 30.0; color property symop
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 *