hdf5_chunking_query_bmr

[svn-r27165] Merge 27133 & 27158 from trunk:
 - Add a new attribute function characterstic for format:
   * H5_ATTR_FORMAT(X,Y,Z)  __attribute__((format(X, Y, Z)))
 - Rename UNUSED attribute characterstic to H5_ATTR_UNUSED.
 - Rename NORETURN attribute characterstic to H5_ATTR_NORETURN

tested with h5committest.