Niflow-manager

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* ENH: Implement nfm test, build and install for Python packages (26)
* ENH: Update Python skeleton with better data packaging instructions (25)
* CI: Add style check (22)

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* ENH: Add Python BIDS App skeleton (18)
* TEST: Test util/git.py (21)
* TEST: Test packaging and Python 3.8 builds (19)
* STY: Switch to Black (19)
* DOC: Update README (19)