[Bf-python] image.reload() - Patch

[Campbell Barton]

Hi, Added an image reload function that is basicly the same as the 
menuItem in the image window.
I did this a while back but implimented in a way that made it crash in 
face select mode :-)

I used it as a part of a script that updated an image realtime in 
blender while it was being edited in the gimp. (couldent get verse working)

Now it works better with no bugs AFAIK.


# EXAMPLE CODE.
image = Image.Load('/test.png')

image.reload() # Udpades the image from the filesystem.
Window.RedrawAll() # Needed so we see the changes right away.

Patch on current CVS attached.
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