[OE-core] [PROPOSAL] Package feature switches, redux.

[Chris Elston]

> Hi, with my Angstrom cap on I like this syntax and I think it will be
> really useful.
> 
> A second level concern I have is about conflicting features, its not
> something we will come across probably in DISTRO land as we are sensible
> enough not to select them. But users could select them in local.conf.
> 
> Graeme

As a new developer, I've discovered that there are plenty of things that
you can set in local.conf which break things :D

Could you please give an example of conflicting features that could
cause problems, I'm not experienced enough with OE to have encountered
that problem yet.

Cheers,

Chris.