Sync with NetBSD. Many fixes to include:

Sync with NetBSD.  Many fixes to include:
-if getpwuid() returns null, print out the uid rather than dereferencing
-Control -d by #ifdef DEBUG; adjust usage message accordingly
-lseek to the beginning of the file in post() which may be called twice
	if a bonus occurs
-add -t flag for slow terminals
-convert to curses and general cleanups
-security improvements which opens scorefile, then drops privs
-use POSIX tty semantics