mad6t.sh bug for flagging failed twiss

[JoschD]

In the mad6t.sh from sixjobs/sixtrack_input (which is used as the mask for running the madx jobs to generate sixtrack input), it checks after run grep -i "TWISS fail" on the madx output-log, and if present flags the job as failed.

In my case I am calling the file /afs/cern.ch/eng/lhc/optics/runII/2016/toolkit/Orbit_Routines.madx which unfortunately contains the line
! preliminary correction with recovery from Twiss failure (unstable machine)
which triggers the grep and causes SixDesk to assume the job has failed.