#1026 improved popup menu of the System Explorer

[Waldemar Eisenmenger]

In the current version of the Sytem Explorer you can see all implemented commands in the popup menu when you do right click on empty System Explorer view (see attached picture).
With the attached patch this commands are just visible when they are needed.

[Zoitl Alois]

thanks for the patch. It has been accepted with cset [fordiac-ide:7199f5]