activateWindow misses slot compatible with (bool)
activateWindow misses slot compatible with (bool)

gui/vistrails_window.py:
- _activateWindow: * new - wraps activateWindow to get usable slot
- update_window_menu: use _activateWindow

Bugfix: Fixes slot bug in PyQt 4.7.3

hjanime/VisTrails,celiafish/VisTrails,VisTrails/VisTrails,minesense/VisTrails,VisTrails/VisTrails,Nikea/VisTrails,celiafish/VisTrails,Nikea/VisTrails,VisTrails/VisTrails,celiafish/VisTrails,celiafish/VisTrails,VisTrails/VisTrails,minesense/VisTrails,minesense/VisTrails,hjanime/VisTrails,hjanime/VisTrails,Nikea/VisTrails,hjanime/VisTrails,minesense/VisTrails,Nikea/VisTrails,VisTrails/VisTrails,minesense/VisTrails,hjanime/VisTrails