experimental QDBM TXN patch

[Stefan Bellon]

Matthias Andree wrote:
> OK, here's the second try of transactions for QDBM. Turns out QDBM
> allows transactions only for writer database handles.

This patch never sets handle->writer. So either, the transaction code
always returns DST_OK without vltran* really being used (as
!handle->writer is always true) or your patch isn't complete.

-- 
Stefan Bellon