[Patch] Some work on money_get::do_get

[Paolo Carlini]

Hi,

this all started trying to avoid this loop:

while (__tmp_units.size() > 1 && __tmp_units[0] == __ctype.widen('0'))
  __tmp_units.erase(__tmp_units.begin());

that I didn't like (repeated calls to widen, repetead calls to erase...).

In the process, I noticed two conformance issues (see testcases):

  1- According to 22.2.6.1.2, p4, "... preceded by a minus sign if and
     only if the result is negative" (see first test).
  2- We tried to fail whenever __tmp_units was empty, but failed to do
     it when _sign.size() && __sign == __neg_sign (see second test).

I find the final result quite clean and efficient ;)

Tested x86-linux, will wait a little for comments, as usual.

Paolo.

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