Migrating dmd to D?

[Vincent]

Andrei, I cannot catch these steps:

> 1. Implement the dtoh standalone program that takes a D module 
> and generates its corresponding C++ header.
>
> 2. Use dtoh to initiate and conduct an incremental port of the 
> compiler. At given points throughout the code D code will 
> coexist and link with C++ code.

Since D is written on C++, what exactly you gonna convert to "C++ 
header"??

Anyway, I offer to keep away from C++ code - it's written with 
"C++ in mind", while D offers brand new world. So I support 
rewritting D on D from scratch.
Initially frontend only + join LLVM backend. And next (if we find 
LLVM not so well) we can write our own backend.