* listing of modules in website already bypassed session user
* altered authenticated endpoint so it does the same
* sudoed a few read accesses & name_get in groups
* other accesses are list/form views, menu only accessible to
system_user
* new-API-ified some calls & unified listing of installed modules
model has been renamed to mail.channel to prepare the slack modeling.
In future commits the mail.group model will be merged with the channel
model from im_chat. The first move is to rename mail.group into
mail.channel to have a model that will unite both features.
Thibault Delavallée