hdf5

[svn-r16362] Description:

 *Fixed cd_nelements in nh5pget_filter_c - cd_nelments not pased in or returned correctly. Since 
        cd_nelmts has IN/OUT attributes, fixed the input and
        returned value of cd_nelmnts to satisfy this specification.

 *Fixed 'name' returned in nH5Pget_external_c - if the size of the fortran buffer is larger then 
        the returned string from the function then we need to give HD5packFstring the 
        fortran buffer size so that it fills the remaining unused characters with blanks. Found
        with the gfortran compiler.

Platforms tested: smirom, liberty