[Users] Upper-face reflection in ReflectionSymmetry.

[Eloisa Bentivegna]

Hello!

It's unlikely that this will affect anyone, but I've found some 
incorrect behavior in the treatment of *upper-face* symmetries in 
ReflectionSymmetry.

I propose the attached patch. In brief, since the loop runs over the 
"source" points in descending order and the "destination" points in 
ascending order, then the index offset between the two sets should just 
be 2 (or 1 if one is staggering the origin), rather than twice the ghost 
size as in the lower-face case.

The change affects branches that are only executed upon 
reflection_upper_*, so most people won't see a difference. Any input?

Eloisa
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