Fixed 2 bugs: - was calling wrong extrapolateBefore/After - should not extrapolate if use_steps is true
Fixed 2 bugs:
- was calling wrong extrapolateBefore/After
- should not extrapolate if use_steps is true

git-svn-id: 9e047e1e624cce0a2485e750063112e834f85522@2612 fc29be9c-2cb0-420d-b520-73dbd18add6e

opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core