Tidy up the initialization step, and add a pre-test step of deleting old result files.
Tidy up the initialization step, and add a pre-test step of deleting old
result files.

meyerj/catkin,thaddeustaylor/catkin,shyamalschandra/catkin,asmodehn/catkin,wkentaro/catkin,beni55/catkin,jack-oquin/catkin,scpeters/catkin,beni55/catkin,harmishhk/catkin,meyerj/catkin,thaddeustaylor/catkin,meyerj/catkin,wkentaro/catkin,jack-oquin/catkin,ros/catkin,harmishhk/catkin,shyamalschandra/catkin,asmodehn/catkin,harmishhk/catkin,ros/catkin,jack-oquin/catkin,ros/catkin,beni55/catkin,thaddeustaylor/catkin,scpeters/catkin,asmodehn/catkin,shyamalschandra/catkin,scpeters/catkin,wkentaro/catkin