[PATCH] Add gradient operator

[Richard Guenther]

Like Div, this adds DiffOps/Grad.  Needed for PIC2d to work.

Ok?

Richard.


2004Jul15  Richard Guenther <richard.guenther at uni-tuebingen.de>

	* src/Field/DiffOps/Grad.h: new.
	src/Field/DiffOps/Grad.UR.h: likewise.
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