Cleaned up the actuator code while looking for a bug in the equations, which I found and fixed: The calculation of [I-hA]^-1 in updating the discrete states was dividing by 1/(J+ch+kh^2) instead of multiplying by it.
Cleaned up the actuator code while looking for a bug in the equations, which I found and fixed: The calculation of [I-hA]^-1 in updating the discrete states was dividing by 1/(J+ch+kh^2) instead of multiplying by it.

Former-commit-id: d2fefa50e664ccbfba6238846ce6936ef0db62af
OpenFAST/OpenFAST,OpenFAST/OpenFAST,OpenFAST/OpenFAST