First attempt at speeding up ghost zone fields

#1322 Merged at ccf2909
Repository
MatthewTurk
Branch
yt
Repository
yt_analysis
Branch
yt
Author
  1. MattT
Reviewers
Description

This implements a few hot-spot optimizations for ghost zone fields. This sped from 35 seconds on issue #944 on my machine to 22 seconds. Still slow. I believe ~8 seconds of that is in IO, which I have not attempted to optimize here.

@drudd can you check the change I made to the RegionSelector, particularly the shifting of LE/RE?

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