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empty transactions.

Moved size-limiting-cache feature to future release, since it

- Added a helper function, ZODB.blob.is_blob_record for testing whether
  a data record is for a blob.  This can be used when iterating over a
  storage to detect blob records so that blob data can be copied.

In the future, we may want to build this into a blob-aware
  iteration interface, so that records get blob file attributes
  automatically.

- Added the IBlobStorageRestoreable interfaces for blob storages
  that support recovery via a restoreBlob method.

- Updated ZODB.blob.BlobStorage to implement
  IBlobStorageRestoreable and to have a copyTransactionsFrom method
  that also copies blob data.

Also removed the version argument from the history method.

number of writes.  This was done during the last phase of two-phase
commit, which made this critical phase more subject to errors than
it should have been.  Also, for large databases, saves were done so
infrequently as to be useless.  The feature was removed to reduce
the chance for errors during the last phase of two-phase commit.

than verifying it.

control.

- Fixed bug in bushy layout: oid recognition pattern would not handle hex
  representations correctly
- Fixed bug in lawn layout: empty strings (the base directory) would be
  recognized as the oid 0.

compatibility for the old `lawn` layout.

instead of a POSKeyError.

mode.

  cache size.