vfprintf: fix confusion about ltoa and ltostr
utils; Add banner, cmp and mkfifo
cksum: add checksum utility
decomp16: decompress 16bit LZ

This is going to give most Z80 boxes a bit of a battering if it works at all.
Committing this more because it'll be an excellent way to test pipes and
abuse the system for stress testing.
utils: add fgrep
grep: replace minimal grep with a full implementation
utils: Add sum
man: add basic man util
syscall_fs2: set nproc in the sysinfo
stat.h: mkfifo prototype
utils: add head
utils: from minixspace this time

Note: sed gives sdcc the shits. Build send with 100 not 20000 or you'll be
waiting all week
utils: Add logname
termios: correct NOFLUSH to NOFLSH and add _POSIX_VDISABLE
tty: correct NOFLUSH to NOFLSH
utils: Add stty
utils: Import yes from ELKS sh-utils and ANSIfy
utils: Add xargs from ELKS
utils: add write from ELKS
fcntl.h: pull in sys/types.h