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

sync now takes a flags argument
break BTF flags up into btree/recno (B_, R_) categories

lint (bug); don't swap meta information when writing the file back,
the __bt_pgout routine should handle this for us

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

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

have to push the dirty page back to mpool, before the sync, so that it
gets written to disk. Then, re-pin the page, and modify it. The MPOOL_DIRTY
bit may not be "correct" for the second mpool_put,

have to push the dirty page back to mpool, before the sync, so that it
gets written to disk. Then, re-pin the page, and modify it. The MPOOL_DIRTY
bit may not be "correct" for the second mpool_put, but since the BTF_DELCRSR
bit is set, it shouldn't matter

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reorder malloc/mpool_get for simplicity; save off error from delete

check MODIFIED bit on sync, before close

implement free page reuse

don't bother with the macros, performance isn't an issue here

htonl -> HTONL

make close of RDONLY succeed; fix sync call to handle a cursor marked
for deletion

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