add operating point to named ss (#122)

* add operating point to named ss

* preserve op through balancing and sminreal

* propagate extra

* merging of ops

* kwarg fix

Author: baggepinnen

Project.toml

@@ -26,7 +26,7 @@ UnPack = "3a884ed6-31ef-47d7-9d2a-63182c4928ed"
 [compat]
 ChainRulesCore = "1"
 ComponentArrays = "0.9, 0.10, 0.11, 0.12, 0.13, 0.14, 0.15"
-ControlSystemsBase = "1.12"
+ControlSystemsBase = "1.17"
 DescriptorSystems = "1.2"
 Distributions = "0.25"
 GenericSchur = "0.5.2"