Handle pcotomo

Overview

• PR to be merged first:
  • !89 (merged)
  • tomoscan!73 (merged)
• fix #88 (closed)
• refactor existing to use the nexus module
  • rework FrameAppender:
    • add handling of h5py.VirtualSource type
    • improve handling of DataUrl
• add pcotomo
  • retrieve information regarding nb_loop and nb_tomo
  • add a dedicated class for PCOTomo
  • add unit tests
• update 'create NXtomo from scratch adding examples by providing externalDataUrl or VirtualSources'
• add test diode is not created from standardacquisition unit test
• add documentation on design:
  • one step to read all entries / node
  • create NXtomo entries associated to those
  • optional rework on NXtomo entries (pcotomo case)
  • save NXtomo according to the configuration file
• allow loading an NXtomo to edit it from the existing API (might use tomoscan). Like NXtomo.load(file_path, data_path) -> NXtomo ? If so: this will be part of another PR
  • add API
  • add unit test
• add a function to split a h5py VirtualDataset from a selection (needed to split an NXTomo)
• update documentation of NXtomo edition

details