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

* More Code cleanup, please watch and learn. :) 

* Code cleaunp

Notes:
*Why do we have some empty panels with no actual content?
*Why is split used when there is only 1 column?

The Povray script has always been some kind of example for other exporters, the UI code need some more cleanup for sure!

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. 

noticed some strange code, added XXX FIXME.

Removed (commented out) Baking from the interface until we work on it again. More important issues need to be solved first. 

- Automatic indentation in Pov file
- Added "command line switch". (Option to set some command line parameter)

-POV file formatting improvement with UI option and function to handle all tabs/spaces indentation (big clean up)
-use of quote characters made more consistent.

-pov max trace level (ray depth)
-pov radiosity importance sampling
-Higher Radiosity samples count (allows Halton sampling)
-pov pretrace_start / pretrace_end
FIXED
-incomplete tooltip for pov low_error
-sky_sphere mapping options:
-world sky gradient to follow pov coordinate system
-Skysphere rotation made independant from camera
-generation of skysphere with image map and BlendSky will just consider the texture for now.

All issues reported here 
http://projects.blender.org/tracker/?func=detail&atid=469&aid=23145&group_id=153
by Constantin Rahn, except Layer selective export, adding it to maydo list

fixed two typo errors and a compatibility for gamma syntax

-Added Distance based Depth of Field (not object based yet)

-Noticed a bug when parts of an object are flat shaded and other parts smooth shaded, not solved this yet.

I had forgotten to change some names I hope it does work  now; This is an adaptation of Povray exporter to render with povray 3.7 
if you want more info, there are pdfs in the zip files here on the tracker: https://projects.blender.org/tracker/index.php?func=detail&aid=22717&group_id=153&atid=468

These scritps still need changes related to parent classes
- mesh_surface_sketch.py
- render_renderfarmfi.py
- space_view3d_align_tools.py
- object_cloud_gen.py

After discussion with Campbell I've made povray an addon as a package (will remove from bf-blender).
Please roport any glitch or mistake I might have done while porting.