<ticket>#338</ticket>
<ticket>#338</ticket>

This fixes the annoying bug that caused the DB Connection 
Setup Dialog to be displayed twice. The problem was a signal
being emitted twice.

vistrails/gui/open_db_window.py
 - QOpenDBWindow.connectSignals()
    Removed unnecessary signal-slot connection for a connection
    item click event (it is taken care by the itemSelectionChanged()
    signal

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