Change to submit runs on salish using bash instead of qsub

[douglatornell]

We dispensed with PBS/Torque on salish when we upgraded it to Ubuntu 20.04 in Sep-2024 because we've always managed load socially rather than via the scheduler.

To accommodate that change we need to:

• Change the submit command from qsub to bash
• Drop the PBS directives section of the run script
• Add redirection to the echo and mpirun commands in the run script because their output is no longer automatically captured