to change it if they so desire

routines since they cannot read a hashed .db file from the old code.
Most of these files just have their RCS/SCCS tags standardized.
Note that mpool.3 has not been updated to reflect the new mpool interface.
o Add a real dbm(3) manpage

pre-2.2 series.

This avoids creating of incorrect symlink ${HOME}/sys -> usr/src/sys when
DESTDIR="".

All POSIX libc api now there (to P1003.1c/D10)
(more md stuff is needed for other libc/arch/*)
(setlogin is no longer a special syscall)
Add -pthread option to gcc (that makes it use -lc_r and -D_POSIX_THREADS).
Doc some re-entrant routines
Add libc_r to intro(3)
dig() uses some libc srcs and an extra -I was needed there.
Add more md stuff to libc_r.
Update includes for the pthreads api
Update libc_r TODO