Various fixes

About

This MR brings various fixes.

To do

• Fix Chebyshev sinogram normalization on half acquisition (close #270 (closed))
• Fix half-acquisition sinogram generation
• Update HA unit tests (see below comment)
• HA: Add optional "transition width" ?
• Fix NXFlatField not working on dataset without projections (close #273 (closed))
• Fix EDF dataset parser not initializeing rotation angles (close #272 (closed))
• Fix histogram computation breaking on "grouped" pipeline
• End-to-end reconstruction tests