Insert one checkpoint node using AFNI's tool for flip detection

[oesteban]

This would be trivial to implement and probably save a few headaches. fMRIPrep should not stop the processing, but report big red banners with each functional when they were found to be flipped.

There's a paper about it - https://www.frontiersin.org/articles/10.3389/fninf.2020.00018/full

[effigies]

Here's the code: https://github.com/afni/afni/blob/a836b5b4834d1525f9404304e218fc90d1bd1c0c/src/python_scripts/scripts/align_epi_anat.py#L2133-L2213