Added hts_multistream

[sambelltacq]

new file HAPI/hts_multistream.py

Now calls rtm-t-stream-disk directly

[petermilne]

Looks great, but please don't assume ANYTHING about the upwards directory structure. Assume we run from the toplevel of AFHBA4040 and all refs are downwards from there eg change

    cmd = f"sudo RTM_DEVNUM={self.lport} NBUFS={args.nbuffers} CONCAT=0 RECYCLE={args.recycle} OUTROOT={self.outroot} 

• ../AFHBA404/STREAM/rtm-t-stream-disk"

• ./STREAM/rtm-t-stream-disk

  cmd += f' | ../AFHBA404/FUNCTIONAL_TESTS/isramp -N1 -m {total_columns} -c {data_columns} -s {step} -i 1 -L {self.logfile}'

• ../AFHBA404/FUNCTIONAL_TESTS +./FUNCTIONAL_TESTS