[z3-five] Deprecating the old local site support

[Philipp von Weitershausen]

Lennart Regebro wrote:
> In Five 1.3 we introduced local site support. In Five 1.5 it gets
> obsolete with the new site suport in zope.component. So, I'm gonna
> deprecate it.
> 
> Because the number of people using this is low, and the new support is
> better, and the old one is messier than the new one, and you can't use
> both at the same time, I think it would be good if we have a short
> deprecation period for this, and deprecate it already for 2.11.

We can deprecate it *in* Zope 2.11, sure. That means we can remove it in
Zope 2.13.