openmp-ize mpcd_stream_zwall and compute_temperature
openmp-ize mpcd_stream_zwall and compute_temperature

pdebuyl-lab/RMPCDMD,pdebuyl-lab/RMPCDMD,pdebuyl/RMPCDMD,laurensdeprez/RMPCDMD,laurensdeprez/RMPCDMD,pdebuyl/RMPCDMD