[v3] more istream::ignore cleanups

[Paolo Carlini]

Benjamin Kosnik wrote:

>>Are those discussions recorded somewhere? In the LWG reflector? I would  be
>>interested in the details: actually, strictly speaking, the whole LFS 
>>idea is not compatible with the C++ standard in the present form...
>>    
>>
>... on the archives of this list.
>
>See:
>http://gcc.gnu.org/ml/libstdc++/2004-09/msg00110.html
>http://gcc.gnu.org/ml/libstdc++/2004-09/msg00126.html
>
>etc, etc, etc. 
>
>Try google with (streamsize lfs site:gcc.gnu.org)
>  
>
Ok, you convinced me that probably this is the most consistent solution.

The below is what I'm finishing regtesting.

Paolo.

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