RFA: Deprecate C++ options

[Benjamin Kosnik]

> Right.  I would say my three personal pet peeves, in order, as a C++
> user, are correctness, compile times, and robustness in the face of
> errors.

So then. 

I'm assuming correctness is being taken care of with the parser rewrite? 

Compile times can/could be taken care of with a combination of some of
the inlining work plus pre compiled headers. 

I think it might be wise to establish a target for a release that
incorporates some of these more far-reaching solutions.

-benjamin