[PATCH] Use StencilEngine in FieldStencil

[Richard Guenther]

This patch drops nearly all special-casing for FieldStencil in that it 
uses the StencilEngine implemented in Engine/Stencil.h.  The 
StencilEngine needs to be able to default construct itself and assign to 
itself for Fields, though.  Thus this capability is added until maybe 
the FieldEngine is fixed.

Tested with the two only FieldStencil tests and the two other Array 
Stencil tests.

A follow up patch could move the Array specific parts of 
Engine/Stencil.h to Array/ArrayStencil.h if desired.

Ok?

Richard.


2004Jul19  Richard Guenther <richard.guenther at uni-tuebingen.de>

	* src/Field/DiffOps/FieldStencil.h: rip out all
      	ApplyFieldStencil engine stuff.
	src/Engine/Stencil.h: prepare StencilEngine being used
	by FieldStencilSimple.
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