Made self._tempdir point at tempdir used (to show meaningful error in out of disk exception situation).

Added exception handling while attempting to create environment directory for BerkeleyDB.

Added module doc string

Imported POSException

Parameterized MAXTEMPFSIZE

Added exception classes

Added docstring to _dbnames explaining what each database is.

Made all struct.pack and struct.unpack calls which deal with integers use signed integer representations.

Added exception handling for out of temp space.

Added workaround for import which defers adding a new object to the "zeroes" directory "out of the gate".  This fixes import (it was broken).

Added a pack method.

ObjectManager.  Also disallowed IDs that end with two underscores.

SOFTWARE_HOME and INSTANCE_HOME.

the PTK.

MailHost legacy methods.

in the public repository.  I actually removed some unnecessary
backslashes from some string concatenations within parenthesized
expressions, or missing close-parens in a module docstring, etc.

  for 2.3a1.

* Commit "WebDAV source" and "hookable PUT creation" features to trunk
  for 2.3a1.