[Bf-python] curve del point bug?

[Ken Hughes]

Campbell Barton wrote:
> Looks like basils found an error in del curve[index]
> he's put together some good examples

This slipped through the crack when we switched how the curve[] 
operation works.  It at one time get/set a bezTriple but now either 
evaluated the curve at a particular time or adds a bezTriple at a 
particular time. delBezier() should not have been deprecated.

Ken