Replacing the forest extension with core functionality

[Neal Becker]

Bryan O'Sullivan wrote:

> I've written up a sketch on the wiki:
> http://www.selenic.com/mercurial/wiki/index.cgi/NestedRepositories
> 
> It's frankly more a collection of questions than of answers, but we need
> to kick this thing off.  I propose a discussion period of one week.
> After that, the coding shall begin.
> 
> <b

As to the question of recursion into modules, why not just have a config
parameter determine that, per-module?