hdf5_der

[svn-r5082] Purpose:
    Bug Fix
Description:
    When reading a contiguous hyperslab that spanned the entire dataset and
    was larger that the type conversion buffer, the hyperslab routines need
    to fill the type conversion buffer and then return to the I/O routines.

    When the I/O routines resume the hyperslab operation, it was possible to
    have a combination of coordinates which caused the hyperslab iterator
    to incorrectly advance in the file, causing some data to be re-read or
    re-written.

Solution:
    Corrected the H5S_hyper_iter_next routine to correctly handle contiguous
    hyperslabs that span the entire dataset dimensions.

Platforms tested:
    Linux (eirene)