convert_halftomo
The method convert_halftomo in preproc/sinogram.py should be private to the main class SinoProcessing, in such a way 'rotation_axis_position' should disappear, using instead private value set by 'set_tor_center'. The reconstruction of the sinogram depends wether the COR is on the right or on the left. It seems that convert_half_tomo deals only with COR on the right.