TODO

- Translate the below into Github issues

- Describe in the documentation the repository, which verifies imported contexts
by downloading them or hashing them

- Describe in the documentation potential "value-added" features that a repo
may implement

- Write an `owm source save` command as a special case of `owm data save` which 

- Make `owm source save` allow to save a directory tree with a user-selected
"data source directory saver" (e.g., an OWMDataSourceDirectorySaver that saves

- Write a convenience function to both save a context and create a distribution
for that context in one go

- Make a component which accepts a context and generates a Python requirements
list from all Python class registry entries

- Note that a Python package must be installed in a fashion accessible to
pkg_resources in order to work with the requirements list feature

- Consider distribution schemes that package Python code together with the data

- Add a further specialization for saving data sources that either prompts for,
or accepts on the command line, the fields for the data source

- Write documentation describing the notion of the (current) data context and
(current) imports context