Set local_work_size to 1 if max_local_work_size is less than the local work size chosen.  This is needed if device is 1 (using CPU).
Set local_work_size to 1 if max_local_work_size is less than the local work size chosen.  This is needed if device is 1 (using CPU).

git-svn-id: 602a26e73ae9f2a14e2bb95676f2e137fcc39919@2830 7c0444ca-5550-0410-9008-faecdbe78eb5

PetaVision/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV