Detailed brain extraction reports

[effigies]

From conversation, with the complex nipype brain extraction workflow, when it fails, it might be useful to have a mode that emits reports for significant stages (e.g., skip ImageMaths, but INU, template->subject registration, and Atropos are big ones) as a standalone BIDS app.

[oesteban]

@eilidhmacnicol's version of the workflow (that one day should be made the default and unique) has several checkpoints at critical steps (INU and antsAI) that could be the best starting point.

[oesteban]

Along the same topic, if we were to hopefully unify nirodents' nibabies' and fmriprep's extraction, these interim reports will be critical to undertake the integration.