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relative path, the blob machinery used relative paths, which could
lead to breakage if an application changed directories.

blobs work for large databases on systems that don't allow many
subdirectories.

- 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.

initialized (as can happen when making a deep copy of a blob object)

- 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.

uncommitted data in (ported from 3.8).
--This line, and those below, will be ignored--

M    src/ZODB/tests/blob_packing.txt
M    src/ZODB/tests/blob_tempdir.txt
M    src/ZODB/tests/testblob.py
M    src/ZODB/blob.py

preventing it.

Added APIs for removing committed blob data that makes files writable
before removing them and updated code that removes committed blobs or
blob directories to use them.

stack traces.

that it is specific to blobs. Added logging when we have to copy.

committed file name.

Make sure that uncommitted data gets cleaned up if w blob is GCed
without committing.

 - some cleanups
 - re-introduced a way to ask for a rename() operation but fall back to copy
   if rename doesn't work
 - using the rename_or_copy for blobs where reasonable
 - fixed a test that was trying to test a failing consumeBlob but where the
   wrong exception was tested for

   new uncommitted data.
 - Made blobs use the temporaryDirectory() method of storages to store new
   uncommitted data near the committed data.

- Unwritten blobs can now be read, and are empty.

- Blobs are considered modified when opened for writing.  This is a
   little bit more conservative than before but fixes a bug that a file
   opened with 'w' actually does modify the file and wasn't considered
   to be a change before.

- Optimistic savepoints now work.

- Fixed bug: could open multiple files for writing.

- Fixed bug: aborting a transaction removed uncommitted data for
   uncommitted blobs.

Todo: 
   Need to remove uncommitted data file if a blob is GCed even when a
   transaction isn't aborted or when it hasn't been added to anything.

- No-longer close files on transaction boundaries.

This allows us to get rid of the transaction-manager dance.

module).

all OS files in binary mode.  Binary mode for blobs is now implicit.

 - added notice to history txt that zodb 3.8 now contains blobs :)