Install headers to correct directory
Install headers to correct directory

Before that the headers where installed to
include/industrial_extrinsic_cal/industrial_extrinsic_cal/. Where
intrinsic_cal didn't find it. (Only visible when using
catkin_make_isolated.)

ros-industrial/industrial_calibration,ros-industrial/industrial_calibration,drchrislewis/industrial_calibration,drchrislewis/industrial_calibration,drchrislewis/industrial_calibration,ros-industrial/industrial_calibration,drchrislewis/industrial_calibration,ros-industrial/industrial_calibration