AXY:Blending

Blending Behavior:

1. global BF (<robot>.bf=<NUM>) is the default BF

1. local BF (move <robot> BF=<NUM>) overwrites that default per motion

1. this results in an effective BF per motion

1. global BFP initialized by the system to -1

1. local BFP overwrites global BFP per motion

1. this results in an effective BFP per motion

1. if the effective BFP is >= 0 (not negative), it overwrites the effective BF

for the previous motion

1. the same shall apply to CP and CPP

with some side effects:

• globally setting BFP to >= 0 is probably a bad idea, because it will

overwrite any and all elaborate local BF, but that's the spec.