Change back to using an isDigit function. We simply don't need to make any

(formally non-portable) assumptions about what happens when an unsigned zero
is decremented, and the code isn't in a performance-critical area.

Remark by jan.nijtmans: The macro is perfectly portable! Not portable is the
exact result of the substraction ('\xB0' - '0' might give 0x80 on some platforms and 0xffffff80 on others), but comparing <= 9 always gives the correct result. We are only checking for digits here! The macro correctly inlines with any compiler, so it's better anyway.

Remark by dkf: But it's less clear. In this code, that's more important than a teeny bit of speed from inlining in a non-critical location.

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