Fixed bug in ActuatorForceProbe: In some instances, I was using indices from _model->getForceSet().getIndex() and _model->getActuators().getIndex(). These indices were inconsistent and therefore ended up crashing my simulations when the model contained both Forces and Actuators. Changed to always use _model->getActuators().getIndex().
Fixed bug in ActuatorForceProbe: In some instances, I was using indices from _model->getForceSet().getIndex() and _model->getActuators().getIndex(). These indices were inconsistent and therefore ended up crashing my simulations when the model contained both Forces and Actuators. Changed to always use _model->getActuators().getIndex().

git-svn-id: 9e047e1e624cce0a2485e750063112e834f85522@7397 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