v1.7.4

ControlSystems v1.7.4

Diff since v1.7.3

Closed issues:

• Allow place to handle multi input systems (#384)
• zpk view of NamedStateSpace structure (#845)
• sigmaplot -- possible to just plot largest and smallest singular values? (#846)

Merged pull requests:

• add differentiable versions of are and hinf (#844) (@baggepinnen)
• handle Int in conversion to tf (#847) (@baggepinnen)
• allow plotting of only largest and smallest sigmas (#848) (@baggepinnen)
• simplify AD examples (#850) (@baggepinnen)
• Make continuous-time lyapunov solver differentiable (#851) (@baggepinnen)
• optimize performance of balance_statespace (#852) (@baggepinnen)
• make PD lyap solver differentiable (#853) (@baggepinnen)
• Implementation of place for MIMO systems (#854) (@baggepinnen)
• remove wrong imports (#855) (@baggepinnen)