[Bf-python] two minor additions to the python interface

[Gregor Mückl]

Hi!

The patch I have appended contains two small additions to blenders python 
interface. 

The first one is the function Blender.Render() which allows a python script to 
invoke the renderer. It takes an additional argument indicating wether 
blender should just render the current frame or the whole animation (it's 
exactly the same difference as between the render and anim buttons in the 
UI). It is not exactly pretty, but quite useful if you have to do some exotic 
rendering jobs.

The second one is the function Scene.Scene.setRenderdir(). It is the 
complement of Scene.Scene.getRenderdir() and is quite useful in combination 
with the Render() function above. However, I'm not quite sure wether my 
implementation of this function does leak any memory.

The files touched by this patch are:

source/blender/python/api2_2x/Blender.c
source/blender/python/api2_2x/Blender.h
source/blender/python/api2_2x/Scene.c

The patch was generated by cvs diff -cp in the directory 
source/blender/python/api2_2x/

I'll be happy to make changes to this patch if it does not meet your 
requirements.

Regards,
Gregor
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