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Changes from the earlier BETA releases.
o dbm_prep does everything now, so dbm_open is just a simple
wrapper that builds the default filenames. dbm_prep no longer
requires a (DBM *) db parameter: it allocates one itself. It
returns (DBM *) db or (DBM *) NULL.
o makroom is now reliable. In the common-case optimization of the page
split, the page into which the incoming key/value pair is to be inserted
is write-deferred (if the split is successful), thereby saving a cosly
write. BUT, if the split does not make enough room (unsuccessful), the
deferred page is written out, as the failure-window is now dependent on
the number of split attempts.
o if -DDUFF is defined, hash function will also use the DUFF construct.
This may look like a micro-performance tweak (maybe it is), but in fact,
the hash function is the third most-heavily used function, after read
and write.
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