[Patch] Fix istream::ignore + minor things

[Paolo Carlini]

Hi,

eventually I fixed ignore this way (__n is > 0 here):

-          while (_M_gcount < __n

+          if (__n != numeric_limits<streamsize>::max())
+            --__n;
+          while (_M_gcount <= __n

Another possibility, would be playing with _M_gcount, inizializing
it to 1 and the --_M_gcount at the end. This permits to spare the
conditional but breaks the general assumption that, at any given
moment, _M_gcount <= number extracted chars. I don't like that.

Took the occasion to tweak a few other bits, tighten some testcases
and add a new one.

Tested x86-linux.

Paolo.

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