Log message on platforms where file-locking isn't supported.

adding Dumper class to ZODB4.

Use 0/1 instead of True/False, since none of the other code uses
True/False.

There are few differences between the two files, except for necessary
differences because of API changes.  This change involves backporting
the new UndoError style from ZODB4.

- Update signature for the Context.parse() method
- Fix some broken markup

And whitespace normalization.

rotate_logs(), which has the same effect but is more Zope 2.5
friendly.

Remove now redundant zLOG import from main().

Darn.  Why didn't the test suite catch this?

confusion caused by having the instance and the class have the same
name.

ChrisM's changes here) it is no longer necessary to call
zLOG.initialize() in order to see logging output.

available, raise a more reasonable exception.

isn't imported by this module unless needed.