Add utility functions: For bulk upload of zotero/bibsonomy entries and/or importing/writing of references

[gregorpirgie]

Currently, you can only upload works from within apis-bibsonomy / your project either through the frontend forms or by writing your own custom script.

Also, you can only add references through the form or through a custom script.

Suggestion:

As these are common tasks in many projects, it would be helpful to have utility functions (or a class or classes) for those tasks, that you only need to pass your data.

[gregorpirgie]

This current state is especially undesirably, because when saving references, you need to fill the "bibtex" field (a django TextField) in the Reference model with a json.dumps - string, that you need to build from a request to zotero, that contains an escaped sequence. This is obscure and hidden in the api_views.py - code. A utility function would/should handle this implementation detail in the background.

[gregorpirgie]

Maybe it would also be good to change the TextField that actually stores a json.dumps - string to a JsonField.

[gregorpirgie]

I am also only familiar with the Zotero implementation of apis-bibsonomy, this might need special attention regarding how the apis-bibsonomy works with Zotero and Bibsonomy respectively.