[2.0] Remove deprecation of delete hash[key] (and change its semantics)

[Leandro Lucarella]

When doing: delete hash[key] in D 1.0, there is a deprecation error about
being an old syntax for hash.remove(key). So now, if you have an hash of
objects, and you want to do explicit memory deallocation, you have to do
something like this:

auto tmp = hash[key];
hash.remove(key);
delete tmp;

Which is ugly and nonsense. Maybe remove it from 1.0 could be
contraversial, but I think there is no point in conserving this ugly
behaviour in 2.0.

-- 
Leandro Lucarella (luca) | Blog colectivo: http://www.mazziblog.com.ar/blog/
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