hdf5_der

[svn-r27689] Merge of r27459 and r27460 from trunk

Minor warning cleanup

(27459) Renamed a few "h5tri_t extended" variables to "h5tri_t was_extended".
Apparently, "extended" is a typedef name someplace in the headers used on
Solaris, which causes potentially confusing warnings to be emitted.

(27460) Minor code cleanup in test/trefer.c

- Fixed an out-of-range char assignment.
- Added a couple of malloc() casts.

Tested on: h5committest