Modify code to be consistent with equivalent python example, xw09.py.  In particular, finally got matrix dimensions consistent with the index ranges for x, y, and z that are actually defined which is essential for wrap to work properly.
Modify code to be consistent with equivalent python example, xw09.py.  In
particular, finally got matrix dimensions consistent with the index ranges
for x, y, and z that are actually defined which is essential for
wrap to work properly.

Results of these changes (and plcont wrap bug squelching in tclAPI.c) are
that x09.tcl produces identical results to xw09.py for the first time.

svn path=/trunk/; revision=3663

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