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Draft: Additional writers features

Pierre Paleo requested to merge additional_writers_features into main

nabu writers uses a number of wrappers on top of tomoscan to make it usable from nabu.

Namely:

  • RawVolume:
    • support volumes appending
    • make sure that both .info and .xml are produced
    • make sure the metadata is the same as the one produced by PyHST2
  • HDF5Volume:
    • write partial reconstruction files with a file suffix (not supported by HDF5Volume)

For HDF5Volume, nabu needs a the start_index parameter for the sub-volume files. Also, a sub-directory is creating to contain the partial files.
For example, if file_prefix="recons" and output_dir="/path/to/out":

    /path/to/out/recons.h5 # final master file
    /path/to/out/recons/
      /path/to/out/recons/recons_00000.h5
      /path/to/out/recons/recons_00100.h5

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