do not call gtkgui_helpers functions in common folder. Also fix a traceback when trying to view systray tooltip

sometimes not, nor in actions->change topic

if we are windows users and we have GTK/PyGTK 2.10 we now use the GTK api about the status icon (trayicon). I tested under GNU/Linux [at gtk2.10 still is not out for Windows] and all works okay apart from the fact that we cannot do cool tooltips and cannot do animation (which is okay by me). TODO: make usage of basic tooltips [better something than nothing] for this new API