Make connector

The Make connector command combines a set of neurons to a connector. To perform the command The neurons will be aligned, packed closely together an transformed into a connector of the appropriate type. See also
 * Input neurons form an input connector
 * Output neurons form an output connector
 * (ordinary) neurons form a closed connector - this operation is not yet implemented
 * 1) Select a group of neurons. The selection can be rather sloppy. It doesn't matter if some pipes or even neurons of another type are included. The commend will analyse the selection and use the most frequent type of neurons.
 * 2) In the context menue open the first entry "Selection" and then "Make connector"
 * Plug
 * Disconnect
 * Split