New version of Priority-AND gate.

--HG--
rename : dia/shapes/FaultTree/FaultTreePriorityAnd.png => dia/shapes/FaultTree/FaultTreePriorityAnd1.png
rename : dia/shapes/FaultTree/FaultTreePriorityAnd.shape => dia/shapes/FaultTree/FaultTreePriorityAnd1.shape