Kill implicit joining of adjacent strings

[Marianne Gagnon]

> For once, I agree with Bearophile. The adjacent string concatenation was a very 
> very early feature, and the ~ completely supplants it. While I don't think it 
> causes many problems, it's a pointless redundancy and should be removed.

Agreed; it seems to be a minor change, and the issue of code compatibility is a guenine one, the later such changes are done, the more code breakage occurs.

So receive my humble +1 :)

-- Auria