rearrangements

See merge request !111

Update edfconfig.py: force angle calculation by default because there is too many EDF headers with rotation key set to 0 instead of the real value.

nxobject.save: fix: saving vds requires to be on the expected working directoy...

See merge request !114

nxobject.save: fix: saving vds requires to be on the expected working directoy to solve relative path

NXDetector: fix issue loading data as virtual sources + add unit test for...

See merge request !113

NXDetector: fix issue loading data as virtual sources + add unit test for loading and dumping the NXdetector data

load NXdetector: improve error message

See merge request !112

add machine electrical current

Closes #85 and #54

See merge request !106

standardacquisition: move `register_frame_timestamp` and `_register_machine_electric_current` defined at `_preprocess_registered_entry` function level to the upper class level