Use of Joint generator is confusing in Digital Circuit plugin

[Danil Sokolov]

Engineers often use Joint node incorrectly by putting it on top of existing wires intending to create a fork (instead of connecting an incoming wire to the joint and several outgoing wires form the Joint). In order to avoid this confusion the tool for Joint generation should be removed. It is more intuitive to start connection form existing wire that sutomatically inserts a joint point.