call OBCS_COPY_TRACER for pTracer (should fix Pb when using  high-order scheme with OB near tile edge)
call OBCS_COPY_TRACER for pTracer (should fix Pb when using
 high-order scheme with OB near tile edge)

altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h