[Patch] Speed up parsing of integer types

[Paolo Carlini]

Hi again,

in the meanwhile I have fixed a couple of bugs (+num (i.e.,
explicit sign) was not accepted for unsigned types; 0x and 0X
alone were accepted for hex base and parsed as 0) and polished
the code here and there.

Regtested on x86-linux both generic/gnu locale models.

Please have a look: barring objections I'd like to commit on
monday.

Thanks,
Paolo.

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