efficient packing (and undo).

ignored when doing GC.  That is, when traversing from the root, if a
reference object wasn't found, it was simply ignored, covering up a
potential problem.  Now raise a key error, which stops packing.

return an object count of 0.

that.

tests more precise to aid test debugging.

Changed the default blob-cache-size-check size to 10%.

Changed the algorithm for deciding the target for blob cache
reduction. Now the target is

blob-cache-size * (100 - blob-cache-size-check)/100

testing a storage. :)

Made it possible to opt out of recovery tests.

blob-storage implementations.

independent.

use "import time" so we can mess with time.time in tests.

non-shared blob directories, you can set a target cache size and the
cache will periodically be reduced to the target size.

To enable blob cache management, a new IBlobStorage method,
openCommittedBlobFile has been added.

defeat FileStorage's index optimization.

data for reading as an ordinary file, rather than as a blob file.
The ordinary file may be used outside the current transaction and
even after the blob's database connection has been closed.

to create configuration files first. This is primarily useful for
exploration and development.

return values.  This in turn simplified the client and server
software.

Added code to select different client and server stubs and input
handlers depening on whether the Z309 or earlier protocols are used.

ZODB 3.8 clients can now talk to ZODB 3.9 servers and the other way
around.

return values.  This in turn simplified the client and server
software.

Added code to select different client and server stubs and input
handlers depening on whether the Z309 or earlier protocols are used.

ZODB 3.8 clients can now talk to ZODB 3.9 servers and the other way
around.

server whose last transaction is older than the last one the client
saw.

cache file open, and preventing it from being cleaned up on windows.