benefit from validator and improve tests

See merge request !81

replace several `create_ini_ref` and `create_final_ref` by `create_ini_flat` and `create_final_dark`

edf2nx: fix issues with the progress.

See merge request !80

flat and projections can be write `interlace` and reseting the progress was a mess.
Simply avoid reseting the progress and only update advancement when write projection.

edfconverter: improve file closing management

Closes #80

See merge request !79

[h52nx] create a dedicated EXTRA_PARAMS_ENERGY_DEFAULT_VALID_KEYS for the documentation of the 'extra params' in the configuration file

h52nx: rename keys for extra parameters when provided by the configuration file

See merge request !78

- add unit to the default name.
- insure backward compatibility by allowing some aliases.

[h52nx][configuration] add  to the EXTRA_PARAMS_ENERGY_VALID_KEYS. Allows to display it on the documentation when .cfg is generated

general improvement

See merge request !76

[app][dxfile2nx] allow to provide pixel size as a single value

Closes #66

See merge request !77

close #66

- incorporated estimaged_cor, start_time, end_time...

Checking it has no sense when create sequence from urls