Validation differences

[adelavega]

validation seems to produce slightly different results-- and one difference is pybids simply skips invalid files, ancpbids seems to throw an error. @erdalkaraca? In particular this causes issues on these files on ds005: `models/ds-005_type interceptonlyrunlevel_model.json'

[erdalkaraca]

@adelavega is the new validator ready to be used? we could integrate it in ancpbids/pybids instead of ancpbids rudimentarily implemented validation rules.

[effigies]

The new validator only does filename validation, but it is schema-based.

The package is bidsschematools and the module is bidsschematools.validator.

[adelavega]

The issue here is pybids specifically ignores models/, see #19