Mesh functors - please review [newfield_revision]

[Scott Haney]

Attached is a patchUniformRectilinarMesh.h adding functor support for 
computing positions, normals (outward and coordinate), cell volumes, 
face areas, and edge lengths. This also includes two functions requested 
by Julian: vetexPosition() and cellContaining() along with a minor 
bug-fix for a problem introduced when we started to use some new 
centering functions.

I'd appreciate it if someone could review this. I will be checking in a 
test of these functors as well once this is done.

Scott

081701.1.patch
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081701.1.patch
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