3dxrd improvements

Description / Goal

Add management of 3d-xrd dataset in nxtomomill.

TODO list

• handle HDF5
  • add a Mock up class for 3D XRD to be done in another PR
  • add unittest
  • add a new application to handle 3d-xrd
  • save motor position for 'rocking'
• handle EDF
  • rework EDF converter might be done in another PR. No the prioroty at this point.

INFO (how to use...)

some example of usage:

• without a configuration file

  nxtomomill h5-3dxrd-2nx bassanite_Bassanite_start_1_4.h5 test_julia_no_cfg.nx --single-file

• with a configuration file

  nxtomomill h5-3dxrd-2nx --config xrd_3d_config.cfg

an example of a configuration file: xrd_3d_config.cfg

Any warning ?

associated materials (screenshot, test scripts...)