enable cfg extras with absolute path, allow having a cfg extra file for one space and not bail about a missing file for the other space
enable cfg extras with absolute path, allow having a cfg extra file for one space and not bail about a missing file for the other space

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