Reimplemented Suurballe class.

- The new version is the specialized version of CapacityScaling.
- It is about 10-20 times faster than the former Suurballe algorithm
and about 20-50 percent faster than CapacityScaling.
- Doc improvements.
- The test file is also replaced.

#!/bin/bash

cd ${0%update-libstd-tag}../doc

mv libstdc++.tag libstdc++.tag.old

wget http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/libstdc++.tag &&

rm libstdc++.tag.old || mv libstdc++.tag.old libstdc++.tag