Matthias Riße

Slices for input substitutions in `datalad run`

2

### Description Currently the only two options for how to substitute inputs into a `datalad run` seem to be either wholesale using `{inputs}`, or a specific input by index using...

Add datalad-cds

8

Checklist - [X] Title of this PR is meaningful: e.g. "Adding my_nifty_package", not "updated meta.yaml". - [X] License file is packaged (see [here](https://github.com/conda-forge/staged-recipes/blob/5eddbd7fc9d1502169089da06c3688d9759be978/recipes/example/meta.yaml#L64-L73) for an example). - [X] Source is...