Multi-CoR reconstruction

About

This MR brings a new CLI tool to reconstruct one slice with varying centers of rotation.

usage example

You need to:

• first: create a nabu configuration

nabu-config --dataset XXXX

• second: launch processing using the nabu-multicor application by providing the 'cor' to be computed like

nabu-multicor nabu.confg 700:800:10

or

nabu-multicor nabu.conf 700,750,800

• third: display the slice reconstructed. To get a faster display with recent version of silx you can go for

  silx view bambou_hercules_0001_rec_*1080.hdf5::/entry*

To do

• Add reset_rot_center to Backprojector
• Add reset_rot_center to CLBackprojector
• Close #415 (closed)
• Implement nabu-multicor app
• Add entry point
• Tests