2008-03-15 Peter Kovacs Overall clean-up in maps.h
2008-03-15 Peter Kovacs More exact concept checking for map concepts.
2008-02-28 Balazs Dezso Renaming types and variables
2008-02-28 Balazs Dezso Fix bug #26 (UndirectedTagIndicator<> does not work)
2008-02-12 Alpar Juttner Merge
2008-02-12 Alpar Juttner Merge
2008-02-12 Peter Kovacs Bug fixes in the ReferenceMap concept.