first pass at making DB use basic integral types (the Alpha port)

__bt_open declared in db.h, don't need it here

4.4BSD snapshot (revision 8.1); add 1993 to copyright

add in __bt_fd, to return a file descriptor

sync now takes a flags argument

fix some types for the Sun compiler

add routine to dump a single page

bt_put can set the key, now, no longer const arg

implement free page reuse

get routines take const *key; move recno externs into recno.h

Rev #2. Redo the btree code add recno's and checkpoint