<bugfix>Fixed visibility of a connected port in ports panel</bugfix> <ticket>#621</ticket>
<bugfix>Fixed visibility of a connected port in ports panel</bugfix>
<ticket>#621</ticket>

gui/pipeline_view.py:
  - QGraphicsModuleItem.buildPortItem: pass visible_ports and add optional ports created
  - QGraphicsModuleItem.getInputPortItem: pass visible_input_ports
  - QGraphicsModuleItem.getOutputPortItem: pass visible_output_ports

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