Enhanced features for distributors and its documentation

The structure of a distributor now also has an automatic preview. When creating a new circuit you can always see the layout of the selected circuit in multi line representation. This way you have a visual contract of the content and the function of the available circuit layouts.

The selection of components from the product database has been enhanced by an improved dialog design. As for other product database, it is now organized by using the tree structure. The symbol of the selected component also directly appears in a preview window.

Managing outgoing terminals was also reorganized and included into a separate tab of the dialog Cable. In the tab you will have the same possibilities as in the function Insert Terminal.