[AppDB] edit version and edit notes

[Scott Ritchie]

Cool, I can edit application version info again when I'm a maintainer
(and a supermaintainer), however I still can't do it if I'm just a
supermaintainer (the only button available in an app version is to
resign as supermaintainer.)

Furthermore, as a related feature request, listing the names of the
supermaintainers in the maintainer field when viewing a version would be
useful, so that it appears that a supermaintained app is actually
maintained.

Thanks for the good work!
-Scott Ritchie