09-11-02 Improved bug in the display of output variables in a document prior simulation

The right click menus was not functioning according to the intention. Enabling or disabling of variables for specific groups could be made both after right clicking and selection of choice. Alternatively the display of all variables that are possible for selection could be done by a single click on the grid with the group name.  However, hiding of non selected variables are only possible by the right click options.