Add -owarpinv to sct_register_multimodal

[joshuacwnewton]

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Description

This PR add the ability to specify the filename of the output inverse warping field. This is relevant for the SCT Course, since we often would rename the files using mv (because the auto-generated filenames were long and awkward).

For this PR, I've tried to mimic the existing programming conventions in sct_register_multimodal (basically just matching -owarp without making any further improvements), just to keep the changes easier to understand/review.

Linked issues

Fixes #1530.

[sandrinebedard]

I tested it out with -owarpinv and it works well! However, when I don't specify the flag, the inverse warping field is not created, but it should be... this may explain the batch pocessing test failling

[joshuacwnewton]

I tested it out with -owarpinv and it works well! However, when I don't specify the flag, the inverse warping field is not created, but it should be... this may explain the batch pocessing test failling

Oops. There was a typo on my part. Sorry about that. 😅

[sandrinebedard]

Works well now! 🎉

One suggestion, we could also remove the lines renaming the warping fileds in batch_processing.sh and use -owarp and -owarpinv as we want to do in the tutorials 😊

[joshuacwnewton]

One suggestion, we could also remove the lines renaming the warping fileds in batch_processing.sh and use -owarp and -owarpinv as we want to do in the tutorials 😊

Ahhh, that's a very good point! Thank you for the reminder. It's easy to forget. 😅

As an aside, it might be worth investigating how much overlap there is between batch_processing.sh and batch_single_subject.sh from the tutorials. If there was a way to use a single script for both purposes, that could save us some maintenance effort, since we could update the tutorials AND batch_processing.sh simultaneously in a single place.