how to get read/write access for profile extension contributor

[Benjamin Kosnik]

> But the general guideline for write access to the SVN tree is
> successful submission of a couple of patches.  That ensures that the
> contributor understands gcc's submission and commit policy to at least
> a minimal degree.  Write access is a powerful tool, since we must
> essentially trust everybody with write access, so the gcc maintainers
> don't normally give it out on spec.

Yep. 

Let's try to work the kinks out with the first couple of patches,
and then when everything looks good after a bit re-discuss.

-benjamin