missing pieces of the previous commit (adds the GUI parts of the process pool statistics window)

git-svn-id: https://pycam.svn.sourceforge.net/svnroot/pycam/trunk@762 bbaffbd6-741e-11dd-a85d-61de82d9cad9

share/gtk-interface/menubar.xml

@@ -22,6 +22,7 @@
     <menu action="WindowMenu">
       <menuitem action="Toggle3DView"/>
       <menuitem action="ToggleLogWindow"/>
+      <menuitem action="ToggleProcessPoolWindow"/>
     </menu>
     <menu action="HelpMenu">
       <menuitem action="HelpIntroduction"/>