Also cleaned up how some of the operators work.  They weren't playing nice
with undo.

So far just IK->FK for biped.arm.

extensions_framework: added ef_callback pseudo-property type for invoking custom draw methods in property_group_renderer

- Summary page now lists border render
- ore.prepare now changes border render off
- ore.prepare now changes full sample off, then save buffers (old was just save buffers which can't be changed if full sample is on)
- A small piece of text that warns about the upload making Blender seem frozen
- Bug fix: ore.prepare() couldn't be called in the old way. The new API prevents changing data during layout drawing. The original ore.prepare operator was changed a bit to not require the call
- Bug fix: Completed / pending / rendering sessions didn't work. Same issue as above: cannot change data during draw functions. Fix is simply removing the problematic call as the list is already generated elsewhere

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

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

also enable preset menu

* 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!

Fixed some other problems with solids script regarding weird names which messed up truncation of verts and edges

- Handle situation when last point of path segment has got the same position,
  as first segment point. It used by Illustrator to set up handles of first
  point and to make segment closed.
  Not sure about standatr about this, maybe SVG files from other editors should
  be handled in different way, if it'll be issues -- could be easily fixed.
- Use black fill as default (all viewers/editors use this).

from Michalis Kamburelis (kambi)

- Fixed rotation matrix
- Fixed unneeded deformation caused by interior transformation for
  used objects (different tags should be handled differently),
  also, SYMBOL tag could have viewBox
- Implemented parsing of colors in rgb(r,g,b) notation

- Fixed exception caused by spaces after last semicolon in style
- Ignore svg namespage in tag names when detecting geometry class

- Remove unneeded "global" specificaitons
- Fixed parsing for paths which contains floating-point numbers
  in format like 10e-2
- Fixes aspect ration when viewBox is specified

setup (not yet added to the default human metarig).

 - Rect
 - Circle
 - Ellipse
 - Line
 - Polyline
 - Polygon

 Also fixed incorrect constant for cm/mm scaling

- Fixed silly error caused by copy-pasteing code from class
  (accessing to self from simple function)
- Fix for illustrator path format -- it doesn't place spaces before
  "minus" sign of next number. Maybe it's time to go out from stypid
  string replacement-splitting to slower but smarter token parser?

io_raw_mesh: fixes,.. already were done but gone 'lost' (no svn history, nothing in patch tracker,...). wtf?!?

add support for single or multiple uv textures. fixed material id. Deal with faces assign to an materials.

- Fixed incorrect usage of 255 color range -- each component should
  be from segment [0..1]
- Added "style" tag parsing