cubicweb-forge #3287511 display roles used by mercurial-server [open]

now that mercurial-server is part of the forge, it is necessary to clearly display the usernames of the people filling the different roles: project owner, project manager, dev who can push to review and dev who can change phase of csets.

priorityimportant
typeenhancement
done in<not specified>
load1.000
load left1.000
closed by<not specified>