- Fix usage of urljoin in webdav.davcmds

> - Restore buildout into functioning
> 

- Restore buildout into functioning

- Forward port fix from Zope 2.9

- Use a copy instead of symlink in setup.py for the special headers.

Also update to newest Five 1.5 (trunk) which has been adjusted to work
with newest testbrowser.

access.

      - reStructuredText/ZReST: setting raw_enabled to 0 for security
        reasons

        reasons

OFS Image: Image and File updated to use isinstance(data, str) and raises TypeError upon encountering unicode objects.

OFS Image: Image and File now both support simple unicode objects for data (they function the same as strings for data).

Exceptions:

  - 'ZServer' code which uses the 'register_subsystem' stuff.

  - Code which imports custom log levels (BLATHER, TRACE), now pulled from
    'zLOG.EventLogger'.

  - Test jigs which play with zLOG's 'write_log'.

  - Usage in 'svn:externals' modules (ZODB, etc.)