WIP: refactor exception handling #117
                
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Created function wrappers in monitor_compat.py for each public function in monitor.py: they call the underlying function in a try block, catch any exceptions, and convert them via a helper _err_str_from_exc() into the legacy error string or tuple.
Module-level globals PROW_URL and final_job_list are proxied so legacy callers that set/read them still work.
The module includes a getattr fallback so any attribute not explicitly wrapped is forwarded to monitor.py, preserving full API coverage.
No breaking changes: monitor.py still behaves as before; legacy calls via monitor_compat.py behave as before in terms of error returns.