hdf5_ep

[svn-r3522] 
Purpose:
    Windows port  and maintenance.
Description:
    Windows Fortran requires explicit interface block for each
    C function called from F90 stub.
    I also added comment block for each F90 function.
Solution:
    Added inteface block for each function.
Platforms tested:
    Linux (eiriene): checked that code is still compiles and runs correctly
    on UNIX.