[FYI] Forward movement on 9404

[Paolo Carlini]

Hi,

in case someone would like to help on testing/adding comments and
what else, before taking a little bit of sleep I'm sending my current
best attempt at fixing 9404 in a clean way, i.e., implementing the
more general points of Nathan's outline for a post-DR169 asset.

I'm quite happy with it! Of course the regression tests are ok and
everything seems quite clean: overflow now happens _always_ when it
should (pptr == epptr) both for filestreams and stringstreams.

I would appreciate, in particular, some help on the legacy <strstream>
bits, which must be broken right now.

Ciao, Paolo

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