[Bf-python] Modifier API additions/chages prior to release?

[Ken Hughes]

I'm scripting something using new code (hey!) and looking at the 
Modifier API, there's two things I think maybe should be changed/added 
prior to the release:

(1) Make .up() and .down() methods of the modifier sequence, not the 
individual modifiers (same thing would apply to Constraints)
(2) Need mod.apply() and (maybe) mod.copy() methods.

These aren't bugs, but changing them now will mean one less thing to do 
when the API refactor happens.

Ken