Parameter_sweep changes, added timer, output changes, new flag to stop on process error

• Added a walltimer to the sweep script
• Changed the output have 5 files for each process:
  1. .input: The command to run the process and all the parameters stated separately
  2. .stdout: The process' stdout
  3. .stderr: The process' stderr
  4. .info: Information about the process run as a json, currently just the walltime but has space to expand to resources used etc.
  5. .status: The process' return code.
• New flag, stop_on_err, stops the entire sweep as soon as a single process hits an error