fix wrong type of EXCH for Qnet + change macros (EXCH & GLOBAL_SUM/MAX) sufix _R4/_R8 to _RS/_RL   when applied to _RS/_RL variable
fix wrong type of EXCH for Qnet
+ change macros (EXCH & GLOBAL_SUM/MAX) sufix _R4/_R8 to _RS/_RL
  when applied to _RS/_RL variable

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