dst = src rather than src dst

[Janice Caron]

Please could D allow the following syntaxes

alias dst = src;
typedef dst = src;

Instead of (or as well as)

alias src dst;
typedef src dst;

I just prefer the destination on the left. Moreover, it would make for greater 
consistency throughout D. It would match up with assignment operators, module 
import renaming, and alias template specializations.