Accept any size/shape for text files in angles_files/translations

In some spec-acquisitions (ID16A/B), scan range is 360 degrees but

• Projections cover the angular range [0, 360[
• One last projection at exactly 360 degrees is taken for alignment (not used for reconstruction)

NXTomomill currently takes this last projection as a valid one.

Besides, information on rotation angles is not always found.

For these reasons, a angles_files.txt file has to be provided in the configuration file. But this file is wrongfully expected to have N+1 values instead of N.

Generally speaking, a more user-friendly behavior when reading these files should be to crop to the first N useful values, and output a warning if more values than necessary are found.