[Patch] String: move and centralize exp growth

[Paolo Carlini]

Hi,

this is the idea implemented! Honestly, I'm very happy with it: now all
the "magic numbers" are only in one place (instead of three!), and the
encapsulation is much better.

I have tested the patch on x86-linux, I would like to do some additional
tests and, if everything goes well, commit to mainline (only, of course!)
very soon.

Paolo.

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