* src/*.[h] all occurences of stl classes are now prefixed with

  * src/*.[h] all occurences of stl classes are now prefixed with
        std::, and all occurences of "using namespace std;" where removed.
        This is to avoid pollution of global namespace in included files.
        Apparently vtk does not avoid this pitfall: when using both
        gdcm and vtk (as in vtk/vtkGdcmReader.cxx) this ended up in a
        collision of various stl members (principally cout...).