Added export of only renderable objects via outliner hide_render property and active layers. Also thanks to all those who helped bringing instances through their designs or advice: Conz, mont29, Campbell.

Render POVRay addon: Now using instances for objects’ data, to avoid having exported hundred times the same mesh/material…
Coded in collaboration with MauriciusRay.

Added spacing_multiplier to object photons block so per object photon count tuning is now possible (see tooltip)

Reorganized the whole pov properties, to place them in PropertyGroups, rather than cluttering the Scene/Material/etc. objects’ spaces…
Also added a new file handling the conversion from existing files using the old pov properties (call the ˘povray render: update to script v0.0.9” operator (bpy.ops.scene.pov_update_properties) in the search box of the 3d views to make the conversion).

*Refactored the whole in-render loop, was inherited from POV 3.6 version, and no more relevant for POV 3.7…

Further Error handling to allow win 32 bits blender builds to render with Povray 64 bits and the other way around.

pep8 edits for povray, also dont use string addition for textblock contents, write newlines separate.

zero length bones had their tail offset in the wrong direction.

API: 34650
fix: x-offset in one mapping of Alphamap was inverted

Fixed: blob finish wrong level raised POV parse error.(the AllObjects.blend test scene now renders (though not all objects supported yet))
Added: support for deactivating all shadows from scene shading panel (per lamp 'no shadow' still works)

Some minor pep8 fixes.

Cleaned up Media and photons UI layouts

The output to Tempfiles no longer exports comments, indentations or LFs (in lists).
New option in Export settings to deactivate LF (line brakes) in lists.
Fixed a material export for normal maps. Was exported two times.
Paths to images are now realpaths, no /../ in absolut paths.

Usage: Deactivate "OS Tempfile" to see the new options.
Some UI and code cleanup. 

Fixed Campbell's noticed strange code: a useless or statement
and made clearer clamping for Front and back diffuse.

noticed some strange code, added XXX FIXME.

- metaballs with no supported elements would give an error. no they are skipped.