Update argument handling for --derivatives #425
Merged
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The initial implementation of bidsargs had --derivatives take the same arguments as previously specified in the template app: action="+". This made the argument alway look for one or more paths. This does not reflect the pybids api, which additionally takes True and False
The fix adjusts this so that --derivatives defaults to False, if provided by itself give True, and if provide with paths, gives a list of Path().