Commitfest documentation

Hi,

In the commitfest application, I was wondering today what was the exact meaning
and difference between open/closed status (is it only for the current
commitfest?) and between «waiting for author» and «Returned with feedback».

I couldn't find a clear definition searching the wiki, the mailing list (too
much unrelated results) or in the app itself.

Maybe the commitfest home page/menu could link to some documentation hosted in
the wiki? Eg. in https://wiki.postgresql.org/wiki/Reviewing_a_Patch

Thoughts? Pointers I missed?

Regards,