This fix will make HelpTopics re-read their underlying filesystem files if Zope is run in debug mode and if the file change
timestamp has changed since the first time the content was read in.

Before this failed::

  line one

    line two

Now this example is handled correctly.

Fixed a couple typos. This DOM really needs some tests. These typos should have been caught long ago.

Updated docbook coverage to allow StructuredText to work. No more KeyErrors upon importing StructuredText. Also updated it to work with the current DocumentClass.py and with docbook 4.1.

which prevented things like strong,emp, and string literals from being
recognized.

things like strong,emp, and literals in the href name

StructuredText section failed to provide the actual colorizable text,
so in-line structured text items were being ignored.

resolved before retrying.

in 304 response to stop apache from returning Content-Length of 0 to client.