[Bf-committers] added index-of-refraction presets popup menu

[Ed Halley]

This patch adds a modest library of 26 common real-world materials and 
their index of refraction (IOR). A small button next to the material IOR 
slider lets users browse the presets and choose one. This was a feature 
request on the wiki.

https://projects.blender.org/tracker/index.php?func=detail&aid=3685&group_id=9&atid=127

(The attached patch has incorrect line numbers and probably cannot be 
applied to CVS directly, though it is just a few lines and can be 
applied with an editor by reading the patch text. This is because I have 
made several patches on other features for this particular file, which 
are still in the queue, and I did not bother to create a whole new 
sandbox for each new feature.)   <--- PLEASE UNFREEZE CVS SOON  ;)

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