- Documented FORCE_PRODUCT_LOAD

- Changed FORCE_PRODUCT_LOAD so that if it is set, it determines
  whether products are installed regardless of whether ZEO_CACHE is
  set. This means that you can disable product installation by setting
  FORCE_PRODUCT_LOAD to an empty string even if you are not using a
  ZEO persistent cache.

- Fixed the help system and Zope Tutorial product to honor
  FORCE_PRODUCT_LOAD.

testrunner output.

When a set of knobs is set on the browser_id_manager "settings" screen,
("look for browser id name in..." and 'automatically encode browser ids..."),
a traversal hook is installed in the browser id manager's container which
causes a) the request to be searched for a browser id name and a browser
id as the first two elements of the URL path and b) for Zope-generated URLs
to contain these path elements.

Various documentation and interface updates.  No interface methods
were harmed in the filming of this checkin, but a few were added or extended
with defaults.

Fix for collector #510, When Python scripts and other "Script" objects were acquired during URL traversal, the __before_publishing_traverse__ code did not properly stop traversal at the script and populate traverse_subpath with the remaining url path elements.

depending on whether the full or a partial test suite was run.  In
particular, in my case there was a EVENT_LOG_FILE turd left in the
environment which was causes StupidLogTest's checkBasics to fail.

The fix is to wipe the environment in both the setup and the tear
down, although I wonder why EventLogTest's teardown didn't clean
things up properly.  Hmm, with this patch the test suite succeeds.

use that everywhere internally instead of setting the global _log_dest
directly.

Small refactor of new getIndexObjects method. Tightened security (since wrapped indexes are more open to untrusted code) and generalized the other assertions for ZCat.

  - Removed unnecessary tuple cast

  - OIBTree.keys() is faster than IOBTree.values()

ZCTextIndex is now associated by path to its lexicon. After replacing a lexicon used by an index, clear the index to make it use the new lexicon.

As the 'if 1:' block for diff preservation was heavily tabbed anyway, I
removed an indent level and the 'if 1:' statement.

Added newline_to_br to manage_tabs_message insertion to allow newlines without passing html over the request, which no longer works due to tainting

small whitespace cleanup (I know, why bother ;^)

  - Catalog.getIndex returns an acquisition wrapped index, use instead of
    Catalog.indexes[...]
  - ZCatalog.getIndexObjects returns the list of index obs also acquisition
    wrapped. Its use is preferred over the previous index_objects method.

Changed Catalog code to utilize getIndex. This is mostly a neutral change except for in clear() which did not used to wrap before calling the index.
Help docs and interfaces updated to reflect the change.

version management screens.

quoted and lack of unquote functions).

receiving them.  This is required to comply with the spec for
cookies, which requires escaping of at least : and blank spaces.

I changed the setCookie routine in both BaseResponse and HTTPResponse
to keep them indentical.  Since they *are* identical, one would think
that one of them could be eliminated.

match those docs.