[v3] tr2: bool_set, dynamic_bitset, ratio

[Benjamin Kosnik <bkoz at redhat dot com>]

Hi Edward! 

I have reviewed and selectively merged your development
branch, libstdcxx-tr2-ideas-branch, into trunk. As ISO C++ is now
looking at new library efforts for TR2 (and N2965 has already been
checked in to trunk) I thought it well-timed.

Please check my work, patch attached. 

On  libstdcxx-tr2-ideas-branch, I found:

1) N1718 + extensions for polynomial. 
2) N2136 bool_set
3) N2050 dynamic_bitset
4) ratio extensions for binary
5) cmath extensions
6) C++0x rope

Of these, I selected 2, 3, and 4 for merging.

It is sad to leave N1718 unmerged, I think there is a lot of good work
here and frankly see N1744 (marked with open status for LWG) as a weaker
candidate. But it's hard for me to justify putting this in given that it
was explicitly rejected by LWG. Perhaps you have current status or
thoughts?

For the rope extensions, I would suggest just adding C++0x bits to
ext/rope, instead of making tr2/rope. 

The <cmath> additions look interesting but I just saw declarations and
no actual implementation so I punted.

I would encourage you to continue working on TR2 projects! This
future work can now proceed on mainline, without a special branch.

tested x86_64/linux

-benjamin

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