Feature: bulk term export and import

[machawk1]

these work in theory but we have no real experience

[machawk1]

@cr625 Expressed that there is a mechanism to do this on the command line into JSON. How does one do this? Let's give some brief documentation on how to reproduce the process.

Also (this might be a separate ticket), one (e.g., an admin) might want to do this from the web UI.

[cr625]

Started this with export terms to json
done from the cli.py file
e.g. # python cli.py exportterms

the export function is defined in admin/data_io.py and the data is exported to app/export

[cr625]

There must be a folder called admin/export in the yamz base directory ../home/cr625/yamz/app/admin/export
if you are in a python environment that has all dependencies installed, typing 'python cli.py exportterms' will generate a json file called terms.json and put it in that directory.

The method is defined in app/admin/data_io.py export_terms() if you want to change the output format or filter it.