2.3, bsddb and 1.85 compatibility

[Christos TZOTZIOY Georgiou]

I found out that some btree files I had created with 2.2.2 bsddb.btopen
are no longer valid for the bsddb.btopen of 2.3 ...  Is there any way to
use them without doing a conversion?  Doing a conversion is no problem,
but I would like to keep on testing some scripts without having to
install 2.3 yet on some servers at the office.

Thanks in advance.
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