Display build year as copyright year.
Display help when any unrecognized option is passed (e.g. "help", "-?")
Options may be prepended with (one or more) dashes or slashes, or not.
Added "clean" cmdline option: replaces 'dpclean' functionality (used as
"clean-up command line" in SCFG).
Removed unused variables (reported by msvc6).
Added short delay when exiting, to make sure "Returning you to <bbs name>"
is displayed.