Include plan generation when adding Load Combinations with the API

Being able to create custom load combos using the API would be extremely useful if there was an option to specify which plans to generate along with each combo (stress, force, deflection, reactions, soil bearing). Having to create the plans manually means it's faster not to use the API at all and just create the combos directly in RAM which can be a time-consuming process.

Please consider adding functionality in the API to specify plans to generate or, by default, generate all standard plans. Thanks