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This allows <Lib$Dir>.tboxlibint to be removed from our command line include
path. Henceforth, clients of this library also won't need to put it (or
C:tboxlibint) in their command line include paths either. It also means that
when building the library, only local copies of header files are used (as
opposed to a mixture of local and exported copies, as previously).

Version 0.28. Tagged as 'tboxlib-0_28'