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Binary formats for `SparseMatrixCSC`

Carsten Bauer requested to merge cb/mmap into master

See #8 (closed)

This PR adds functions for writing, reading, and memory mapping sparse matrices to and from disk using custom binary formats:

  • BCSC (Binary Compressed Sparse Column): single file, see docs for specification
  • Three separate binary files for colptr, rowval, nzval (what Michael used in the past)

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