Profile include support, round 2

[Greg Hudson]

On Tue, 2010-08-24 at 11:45 -0400, Nicolas Williams wrote:
> > Following remctl's lead, includedir only parses files with names
> > containing alphanumeric characters and underscores.
> 
> In any particular order?

No particular order (which is also true of remctl, as far as I could
tell).  For the currently envisioned use cases involving plugins, I
don't think there's any ordering dependency.