[boost] [Review] Collection traits library

We should accept the collection traits library into Boost. Collection traits address an annoying inconsistency in the use of collections. The documentation is sound, I did not find any issues when skimming the source code, and the testing looks adequate. Only two little nitpicks: - A misspelling: "funtions" in ExternalCollectionConcept synopsis. - Need to get copyright/license into files in the "test" subdirectory. Doug