[CONV] IXI-to-BIDS modifications to fit BIDS specifications 1.10

[AliceJoubert]

TODO :

• Add missing DWI b files (see inheritance principle since same values for all files)
• Fix TSV format
• Update unit tests
• Update regression tests

Data PR: https://github.com/aramis-lab/clinica_data_ci/pull/72

[NicolasGensollen]

Thanks for working on this @AliceJoubert !
The PR LGTM. I suppose the non regression test for ixi-to-bids is going to fail and you will open a data PR to add the bvec and bval files to the CI data, right ?

[AliceJoubert]

Thanks for the review @NicolasGensollen ! Yes absolutely ^^

[NicolasGensollen]

Alright ! Tests are passing with the new data.
Merging...