Kill whitespace
TEST: Add minimal test for EnsureListOf
Merge branch 'neurosbh-paraval' into cmdline_modular

* neurosbh-paraval:
  TEST: Add minimal test for EnsureListOf
  Kill whitespace
ENH: Allow for (partial) overwrite of parameter properties in cmdline arguments
BF: argparse sends each individual value through the type spec

PolyDetrend wants ListOf(str), but each str is send individually,
leading to nested lists of characters.
BF: ROI ID argument handling was broken
DOC: Draft of a cmdline example for some fMRI analyses