- fixed broken except statement

storage speak, lrevid pointers to shared pickle data in earlier
transactions.

Specifically,

The _Record object now has a data_txn attribute that is either None or
the id of the transaction that contains the data used by the current
record.  Example: When transactionalUndo() modifies an object, it
typical creates a new data record that points at the transaction
before the undo.  The new record contains the same logical data as the
record it refers to.  (For consistency purposes, this is a stronger
claim than that the pickles in two different data records are the
same.)

_Record.__init__(): Gets data_txn passed in from
_RecordIterator.__getitem__(), which in turn getes the lrevid from
Full._loadSerialEx().

_loadSerialEx(): Now returns the backpointer, aka lrevid but only if
it is not the same as the serial argument.  They will always be the
same (and we'll always return None) except in the face of
transactionalUndo, commitVersion, and abortVersion.

input field (collector #117).

- determine the directory containing the supplemental data file in the
  normal way
- don't use assert statements; use the appropriate self.assert*()
  methods consistently
- organize imports in Python Normal Form
- whitespace cleanup

getId.  This is a change designed to make it possible to disambiguate user names and user ids in subclasses of user folders, while still doing the "right thing" with respect to local data structures that keep pointers to user ids (eg. local roles, etc.)

Zope tree every time the DAV Lock Manager control panel is visited, it
gives the user a chance to specify a path to start from, shortening
query times (especially in large databases).

PageTemplateFiles were previously owned by whatever object contained
them.  This resulted in very hard bugs if the user who owned the
container was removed.  Since PageTemplateFiles come from the
filesystem, they are now "unowned", similar to DTMLFiles.  Security is
still applied, but now it is applied correctly.

Ahem, *cough*: "Please run the test suite before checking in a change! At
the very least run the tests for the package you changed."

Date is a required header in RFC822 and RFC2822, so MailHost now adds it if it doesn't exist.

Note that I'm not sure the pids written to the pidfile always make
sense.

in addition to the loads and stores.

as pruning of old no longer existing modules).

when it caught a signal related to any of these signal numbers. ;-)  Instead, it
actually tries now to kill its child process with the same signal.

Pidfile handling improved.

When Zope is started under zdaemon, it no longer writes its own pidfile.  Instead, it passes in the path to Z2.pid to zdaemon as its pidfile name.  The 'zProcessManager.pid' file is no longer ever written.

This caused a change to the -Z option of z2.py which should be mostly backwards-compatible (unless people were relying on zProcessManager.pid to be written).  Now the -Z option is a boolean.  -Z1 means use a daemon.  -Z0 means dont.  The default is -Z1.

Write pidfiles out with trailing newlines.

Minor reorganization of "SignalPasser" code (move it from its own module into zdaemon).