[Dune] More flyspray permissions for contributors

[Christoph Grüninger]

Hi Jö,
I am satisfied with your proposal.

I introduced the contributors for the purpose to separate the 
trustworthy basic users from the not trustworthy users. But if we grant 
everybody these rights this is not necessary anymore.

Greets
Christoph

-- 
Unix is simple and coherent, but it takes a genius – or at any
rate a programmer – to understand and appreciate the simplicity.
[Dennis Ritchie, 1941-2011, created C and Unix]