Make copyTransactionsFrom much faster in history-free storages when possible #431
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By using
record_iternext
and only copying current objects. The big win comes from batching up the transaction commits. The speed increase seems to be at least 5x or more.Disabled with the
--incremental
option of zodbconvert; see updated documenattion.There are additional tests to make sure blobs are copied, and for the handling of storage wrappers like zc.zlibstorage.
Fixes #425