[Bf-python] Quit function

[Campbell Barton]

Hi, found  setBorder(), PupIntInput(), PupFloatInput() in blender CVS. 
look forward to the EPY Docs being updated so people can use them.

3 New things Id like to add, the first 2 should be ok with you guys.

RenderData.getBorder(), would be easy to add and may be able to be used 
for some exporters so they only render the border too.

Draw.PupMultiInput(), this is a hook to the do_clever_button function in 
C that creates a popup with multiple buttons, this can be user for text 
input as well.
The syntax of this will be a bit complex, all the buttons will be 
defined in the 'name' variable (like PupMenu) as well as there type and 
limits.
I think this should be added, but the implimentation may be a thing to 
discuss.

Blender.sys.quit(), Quit blender, I need this function in blender for my 
renderfarm script, would there be any problems with adding this?

- Cam