r24: - Replace repetitive bailout code in command-line parsing with a macro
r24: - Replace repetitive bailout code in command-line parsing with a macro

- Add blank line between parse error and usage information, for readability

- Fix compile errors with VERBOSE_DEBUG enabled

cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr