Better handling of inexact computation.
We do not use tolerance for excess, just for edges
3 cd ${0%update-libstd-tag}../doc
4 mv libstdc++.tag libstdc++.tag.old
5 wget http://gcc.gnu.org/onlinedocs/libstdc++/latest-doxygen/libstdc++.tag &&
6 rm libstdc++.tag.old || mv libstdc++.tag.old libstdc++.tag