community module

Overview

Via a configuration we should enable administrators to activate certain community features in geonetwork. Community features include:

Users can comment on metadata documents in the catalogue
Users can submit a request for data of which they think it should be added to the catalogue

Groups (or projects) can be created in the catalogue,
users can be invited to join (or request access to) a group, users can unregister from a group
A group is also described as iso19139, so it has a title/abstract/location. This info can be presented on a group page.
A groups page is available where the location of (popular) groups is plotted on a map.
A group-admin can create events in a group (an event is a webinar, meeting or fieldsession). Events related to a group are displayed as an agenda on the group page
The group-admin can send messages to group members (to invite them for an event).

Users can create a (map) visualisation (wmc/ows_context) and share it in twitter/facebook/email or store it in the catalogue.
Option to embed the map in a website, A snippet is presented to integrate the map in a webpage.
There should be an endpoint available that creates a full screen map to be embedded in an Iframe