hdf5_ep

[svn-r4977] 
Purpose:
    Adding support for dll
Description:
    Added __DLLCPP__ to all public classes and templates.
    Added #include "H5Include.h" to H5RefCounter.cpp because of the
          use of DLLCPP in .h file and it needs the following chain:
                H5Include.h/hdf5.h/H5public.h/H5api_adpt.h
    Added #pragma warning(disable: 4251) to H5Exception.h to eliminate
        this warning on private data members of type 'string.'  This
        occurs because 'string' is not yet instantiated at compilation
        time; however, since the class is exported, the warning is
        harmless.
    Changed this member function's parameter to be passed as reference.
        from:
            void CompType::insertMember( const string name,...
        to:
            void CompType::insertMember( const string& name,...
Platforms tested:
    Linux 6.2 (eirene)
    Windows 2000