Slight changes to main(): - moved curses UI initialization code *after* the getopt block, which allows   the use of getopt to detect values of -u parameter - added comments to identify functional blocks in main() - added showusage flag to getopt processing & validation, flag is checked   and acted upon (llwprintf(usage); exit_it(1);) prior to main program loop - removed 'system("clear");' call from exit_it() so that non-curses error   messages stay on the screen
Slight changes to main():
- moved curses UI initialization code *after* the getopt block, which allows
  the use of getopt to detect values of -u parameter
- added comments to identify functional blocks in main()
- added showusage flag to getopt processing & validation, flag is checked
  and acted upon (llwprintf(usage); exit_it(1);) prior to main program loop
- removed 'system("clear");' call from exit_it() so that non-curses error
  messages stay on the screen

MarcNo/lifelines,disassembler/Lifelines,MarcNo/lifelines,MarcNo/lifelines,MarcNo/lifelines,disassembler/Lifelines,disassembler/Lifelines,disassembler/Lifelines