[Bf-python] Patch- Added A Python Hook for the error function.

[Campbell Barton]

Hi, I have been thinking that its silly that the conslole is the only 
way to give users textual feedback in python is by using the console 
window or by having a GUI and making the error text feedback a part or 
the gui.

I have added a patch that allows you to make error popups.

Like this

import Blender
Blender.Window.PopupError('Print This error message')

- I have tried to conform to the standards and dobumentation is included 
in the patch

I think the next thing Ill do is Window.PoputNumInput(text, min, max, steps)
then Mabe PoputTextInput()
This would be nice for plugins where only a few inputs were needed and 
having a gui in a window to its self would be too bulky.

- Cam
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