Extends the align_cor procedure with estimators dedicated to the CoR

This PR rework a bit the procedure with align the center of rotation.

Closes #164

• Renamed align into align_cor
• Added method to allow to change the estimator by configuration
• For backward compatibility, if no method is defined 1d-correlation is used.
• Added a set of method which only estime the center of rotation (and not the tilt) (feedback from ID16A)

The procedure can be configured the following way

        - name: my_align
          plugin: bliss
          class: AlignCor
          package: tomo.procedures.align_cor

          # Method to extract the CoR correction
          # For center of rotation and tilt, one of
          # (see http://www.silx.org/pub/nabu/doc/apidoc/nabu.estimation.tilt.html)
          # - `1d-correlation`: Correction for the CoR and detector tilt
          # - `fft-polar`: Correction for the CoR and detector tilt
          # For center of rotation only, one of
          # (see http://www.silx.org/pub/nabu/doc/apidoc/nabu.estimation.cor.html)
          # - `simple`               <- for ID16A
          # - `sliding-window`
          # - `growing-window`
          # - `global-search`        <- the slowest
          # - `octave-accurate`      <- for ID16B
          method: '1d-correlation'

In the future, we could think about changing the method from the UI (it would not be a config, but a state of the procedure).