[boost] MSVC 7.1 warnings for lexical_cast.hpp

Hi all. I was wandering if someone could disable the following warnings for the lexical_cast.hpp file when compiled with the MSVC 7.1 compiler: * 4511 - Copy constructor shall not be generated. * 4512 - Assignment operator could not be generated. * 4127 - Conditional expression is constant. They are reported at high warning reporting levels and easy to work around by preparing my own wrapper header that disables them but I would really like it if boost could do this out-of-the-box. Best regards, Jurko Gospodnetiæ