%inc parts work-in-progress

Specifies a control request which is sent to a controlled SimTree instance.
Each request consists of

* the control object. The control object is the target for the command inside
  the controlled SimTree instance. Each object specifies an internal resource in SimTree.
  
* the control method. The control method tells the adressed object, what it should do. Each
  object understands a defined set of methods.

* optional parameters to the control method. The parameters may appear in any order.

The object and the method are separated wth a . . The parameters are appended to this string
with -.

%inc parts control-where
