Improved behavior of "Emission Viewer"

Fixed wrong behavior of Emission Viewer when used with groups.
When one of the outputs of the group was of 'SHADER' type - previewing
other outputs didn't work.
Now it's fixed.
Emission Viewer - update preview

Added hack to update preview.
Move named layer manager addon from contrib to community addons (see T41317).
Fix T41316: FBX exporter in Blender cause artifacts to appear on meshes with Shape Keys.

For some reason, Unity (and FBX SDK in general?) does not support well mixing
normals and smooth data, at least when using shapekeys.

Odd, odd, you said odd? That's odd...

Anyway, we do not really need both of those data at the same time, so for now
either write smooth or normals data, not both!
Merge remote-tracking branch 'hm-blender/master'

* hm-blender/master:
  Fix T41316: FBX exporter in Blender cause artifacts to appear on meshes with Shape Keys.
  Move named layer manager addon from contrib to community addons (see T41317).
  Emission Viewer - update preview
  Improved behavior of "Emission Viewer"
FBX IO: Fix wrong orientation of lamps (were rotated 180deg).
Merge remote-tracking branch 'hm-blender/master'

* hm-blender/master:
  FBX IO: Fix wrong orientation of lamps (were rotated 180deg).
FBX export: add support for ortho cameras.
Patch T41093: Cleanup non-manifold

by Caretdashcaret with own edits
Fix T41396: FBX export fails with some very simple material setups.
Official pie menus add-on.

Inludes the menus documented in blender 2.72 release notes,

http://wiki.blender.org/index.php/Dev:Ref/Release_Notes/2.72/UI
Merge remote-tracking branch 'hm-blender/master'

* hm-blender/master:
  Fix T41396: FBX export fails with some very simple material setups.
  Patch T41093: Cleanup non-manifold
  FBX export: add support for ortho cameras.
FBX Export: export dummy default material instaed of nothing, when handling
unsuported mat type (like nodal ones).

See T41396 for rationals (having dummy placeholder still helps e.g. with
face-assigned materials...). Thanks to piiichan (Arnaud Couturier) for raising that issue.
Fix T41405: FBX export issue with 2.71.3 Hash: ee8dafe.

Own mistake in previous smoothdata vs normals fix.
Grr, yet another FBX export material fix, hope this is the last!
remove from shift/a, add to "Create" tab. panel use fixes editmode context issues.
make manipulator pie enable manipulator when one of the options is selected
remove menu level for cleaner integration.
Modify add-on so it that it doesn't error out in background mode.
Added "Modulo" and "Absolute" math operations

1. "NWBatchChangeNodes" class was missing two operations: "Modulo" and
"Absolute".
2. Order of operations was not up to date.