Bug 298835 Merge e4 Project Path Variable back into the 3.6 stream
The virtual folder and filters changes are already in 3.6, the project path variable changes in e4 still remains to be merged.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/PathVariablesGroup.java
* longer needed.
     * 
     * @param parent the widget parent
     * @return container of the widgets 
     */
    public Control createContents(Composite parent) {
        Font font = parent.getFont();
        if (imageUnkown == null) {
            ImageDescriptor descriptor = AbstractUIPlugin
                    .imageDescriptorFromPlugin(
                            IDEWorkbenchPlugin.IDE_WORKBENCH,
                            "$nl$/icons/full/obj16/warning.gif"); 
            imageUnkown = descriptor.createImage();
        }
        initializeDialogUnits(parent);
        shell = parent.getShell();
        
        Composite pageComponent = new Composite(parent, SWT.NULL);
        GridLayout layout = new GridLayout();
        layout.numColumns = 2;
        layout.marginWidth = 0;
        layout.marginHeight = 0;
        pageComponent.setLayout(layout);
        GridData data = new GridData(GridData.FILL_BOTH);
        data.widthHint = SIZING_SELECTION_PANE_WIDTH;
        pageComponent.setLayoutData(data);
        pageComponent.setFont(font);
        
        variableLabel = new Label(pageComponent, SWT.LEFT);
        if (currentResource == null)