Reorganize command and pickCommand to allow per-node show
Remove TODOs
Fix tests
Update CHANGES.md
Added per-node show
Merge remote-tracking branch 'origin/master' into show
Merge master to show
Merge pull request #2361 from AnalyticalGraphicsInc/box-graphics

Use dimensions, instead of min/max corners, for BoxGraphics
Merge remote-tracking branch 'origin/master' into show
Merge pull request #2352 from AnalyticalGraphicsInc/show

Per-node show/hide for 3D models
Merge remote-tracking branch 'origin/master' into polygongraphics-holes
Merge branch 'polygongraphics-holes' into implicit-properties