Merge pull request #17 from datalad/enh-pip-install #76

Job	Run time
Install Datalad and Get	1m 11s
Install Datalad, Get and Cache (ubuntu-20.04)	1m 4s
Get With Install	1m 5s
Install Datalad, Get and Cache (macos-10.15)	1s
Install Datalad and Get test dataset with globs and tricky path names	1m 8s
Install Datalad, Get and Cache (ubuntu-latest)	1m 11s
Install Datalad and Get into specific path and get some sample data paths	58s
Install Datalad	1m 23s
Install Datalad, Get and Cache (macos-latest)	1m 11s
Install Datalad via Branch	58s
Install Datalad via Full Clone	1m 6s
Install Datalad with some extensions	56s
Install Datalad via Release	51s
	13m 3s

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