Feature roadmap/Collaboration groups

Feature subcategory		Is part of::Category:Collaboration
Requesters		{{#arraymap:Peru|,|x|Requested by::x}}
Requirements		Group support in gabble and salut (Trac #4043)
Specification		See also XS roadmap and scalable eJabberd based on groups: Trac id 8165.
Owners		{{#arraymap:Eben|,|x|Contact person::User:x}}
Priority		Priority::2
Helps deployability?		Helps deployability::no
Target for 9.1?		Target for 9.1::no