backport of TAL fixes from z3

- i18n and metal interactions

- fix handling of nested translations with tal:content/replace and i18n:name

some reformatting to ease comparisons between 2.x and 3

!!! There is still one problem left: I could not find a page matching
the old http://www.zope.org/SiteIndex/searchForm on the new site !!!

- shipping docutils with optparse/textwrap from Python 2.3 to avoid
  major changes to the docutils code

Be more careful about specifying a container class: root databases should not have a container class.

to an object but returns the name instead of the object (for values
that should be strings that later resolve to an object during startup).

Fix container-class functionality.  It could be specified in the configuration
but was never actually used.

Alias the SimpleTemporaryContainer at the package level.

- Use autoClassFactory by default.  This is better for mounted databases
  than the default.

- Don't specify a default connection class; let the database decide the
  default.

- Allow database types other than zodb_db.

Also set the connection class only when specified.

Changes:

 - startup log handler now pays attention to the logging levels of
   the handlers defined within the config file and uses the "lowest"
   level to log messages to stdout during startup.

 - entirely removed warning when the starting user's umask is "too
   permissive".  it wasn't clear that it added any value under normal
   operations.

 - replaced ancient setuid code with code stolen from zdaemon that
   works the same but looks nicer.

Don't try to optimize by checking for disabled and effective levels within the log method.  The logger's level may not be meaningful if this logger is configured with handlers that accept messages at a lower level than that of the logger itself.

DeprecationWarnings in Python 2.3 go away. See
http://www.python.org/peps/pep-0263.html for more information.

quickstart page if the root acl_users contains no users.  Required an
additional default user folder method, hasUsers.

work again.