vchoi_fork

[svn-r1944] Added "H5S_SELECT_PREPEND" and "H5S_SELECT_APPEND" operations to point
selections.

Also fixed bug which was not allowing the "start_point" parameter to
H5Sget_select_elem_pointlist to actually get used.  It was always returning a
list of points selected which started with the beginning of the list of points.