update backproperrorsv2cached.cl to use copyLocal function
update backproperrorsv2cached.cl to use copyLocal function

Peilong/DeepCL,FighterLYL/DeepCL,mrgloom/DeepCL,pimms/DeepCL,hughperkins/DeepCL,hughperkins/DeepCL,pimms/DeepCL,FighterLYL/DeepCL,FighterLYL/DeepCL,Peilong/DeepCL,hughperkins/DeepCL,mrgloom/DeepCL,MiniLight/DeepCL,FighterLYL/DeepCL,mrgloom/DeepCL,pimms/DeepCL,MiniLight/DeepCL,pimms/DeepCL,Peilong/DeepCL,mrgloom/DeepCL,hughperkins/DeepCL,hughperkins/DeepCL,MiniLight/DeepCL,MiniLight/DeepCL,Peilong/DeepCL,MiniLight/DeepCL,mrgloom/DeepCL,FighterLYL/DeepCL,pimms/DeepCL,Peilong/DeepCL