[Patch] Fix a serious bug in money_get

[Paolo Carlini]

Hi,

this is interesting: I wanted just to simplify an overly complex
double loop in the parsing of the remaining sign characters.

Turned out that the double loop lead to an *overly* permissive
parsing (wrong according to 22.2.6.1.2, p3) and a pair of broken
testcases (money_get/.../8.cc, using do_pos_format, which, according
to 22.2.6.1.2, p1 isn't active during input) was passing by chance.

Other tests were also incorrect: the parsing didn't reach the end
of the input, and goodbit instead of eofbit was expected.

This is a pure bug fix and I mean to apply the patch to 3_4 too,
tomorrow.

Tested x86-linux.

Paolo.

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