Allow to share groups with people using JabRef or other reference managers

[tobiasdiez]

It's quite common to work on a paper with multiple people. In this case, one would like to have a group of documents (e.g. the ones cited / helpful for the manuscript) that is shared between multiple people.

• Support for sync groups between multiple people using JabRef
• Support for people using other reference managers, as a starter support at least Zotero.