Move the unordered library into 'branches' now that it has been accepted.

svn path=/branches/unordered/refactor/Jamfile.v2; revision=42181
Merge.

svn path=/branches/unordered/refactor/doc/; revision=42408
Remove the unordered/refactor branch as it's long abandoned.

svn path=/branches/unordered/refactor/doc/; revision=45745