Improve syntax display:
- Begin each enumeration of parameters with its actual name.
- Sort parameters alphabetically
- New parameter "--log" for selective-debug: With OpenMPI, log debugger output to a per-rank log file
- New parameter "--log-quiet" for selective debug: Redirect debugger output to log file, do not show it on terminal
- Initialize all optional globals at their definition so we don't forget to set them in the parser when adding new ones
Allow the user to pass parameters to the debugger