mod_http_oauth2: Allow user to decide which requested scopes to grant These should at the very least be shown to the user, so they can decide whether to grant them. Considered whether to filter the requested scopes down to actually understood scopes that would be granted, but decided that this was a bit complex for a first step, since role role selection and other kinds of scopes are mixed into the same field here.

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summary: Lets users create and join roster groups
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Introduction
============

This module lets you join groups using an ad-hoc command. When a user
joins a group, everyone in the group is added to their roster, and they
are added to the rosters of existing members.

TODO
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-   Leaving groups
-   Add a roster group/tag when adding roster items (tricky with current
    rostermanager API)