std.allocator needs your help

[Adam D. Ruppe]

We should really deprecate the new keyword. It'd break like all 
code ever, but with D's templates, there's no need for it, and 
when it is there, it is going to spark problems about replacing 
global allocators or the library allocators being second class 
citizens.

Maybe we could minimize the breakage by just rewriting the 
keyword into a library function call, which could then be 
overridden with local variables or imports  via normal scoping.