[Patch] Again on __copy_streambufs

[Paolo Carlini]

Hi,

I guess that for while this will be the last contribution
from me in this specific area. I'm quite happy with it, now ;)

The patch does two, mostly unrelated, things:

 1- Remove any reference to _M_buf_size: this is incorrect
    now, since basic_stringbuf doesn't use it, and isn't
    useful anymore since the various in_avail/sync/interactive
    troubles at the root of it have been fixed elsewhere.

 2- When there is no room in the output buffer, instead of
    copying 'til the end one char at the time in a loop try
    to make room by calling overflow (thanks Nathan!).

Tested x86-linux + 27_io/objects by hand + a few sanity checks.

Ok for trunk?

Paolo.

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