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

the __rec_search value shouldn't be stored in a static, can't pin
across calls in that case

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

index_t -> indx_t

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

clear the stack in the search routine; it's a lot simpler

prettiness police

nrec is 0-based, here, so > recno, not >= recno, also index was
off-by-one when incrementing/decrementing internal page counts

__bt_push index was off-by-one

drop exact flag (always exact if found at all); increment/decrement
parent pages while searching the tree instead of waiting

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