hdf5_msb

[svn-r2702] Purpose:
    Code cleanup
Description:
    There's been a compiler warning about modifying a 'const' object in the
    H5T_copy routine for several years now, which a few users have reported.
Solution:
    Removed call to sort the old datatype (the const object) and changed the
    code to work with unsorted datatypes.
Platforms tested:
    FreeBSD 4.1.1 (hawkwind)