cast alloc's to shut SunOS up

if DB_LOCK not set, pin page across calls and don't copy key/data pair

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

bcmp/bcopy/bzero -> memcmp/memmove/memset

move db.h to the end of the includes, make compat.h work better

copy the length of the data, not the length of the buffer

return the keys as well as the data

increment necessary dsize by 1 so that we don't crash if the first
record retrieved is 0 length.

use intermediate on realloc so can recover from failure

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