[Bf-python] Ipos and Keys

[Ken Hughes]

Was trying to figure out how to add support for keys/shapes to Mesh 
today and was looking at the NMesh API.  I realized then that some of 
Ton's changes to the IPO module mean that key IPOs don't have unique 
names anymore; all keys return the name "Key".  This is kind of weird, 
since if you get the name of the keyblocks they say "Key 1", "Key 2", 
etc.  So seems like, since the Ipocurve is "linked" to a particular 
keyblock, there should either be a method/attribute to get the Ipo from 
the key, or the Ipocurve should have the same name as the key.

Ken