Merge branch 'fixes_post_visit_id16b' into '0.10'

fixes bug found in edf2nx after some time on ID16b

See merge request !126

(cherry picked from commit 4c7b75f6)

684dc2cf remove useless print
04a3910c nexus: nxobject: fix: __str__ was not returning a string
de6339fe raise an error is scan_range or tomo_n is None (fail to discover .info file)
70c6d5a3 edf2nx: fix computing rotation angle when no key in the header
d2947e44 edf2nx: rework rotation angle creation when forced.
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