the logging module of Python

Collector #1441: Removed headers introduced to make Microsoft webfolders and office apps happy, since they make a lot of standards-compliant things unhappy AND they trick MS Office into trying to edit office files stored in Zope via WebDAV even when the user isn't allowed to edit them and is only trying to download them.

Collector #1445: Fixed bad interaction between -p and -v(v) options to test.py that resulted in exceptions being printed when they shouldn't have been.

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for a better and unique error handling

DateTime instance

     - added "version.txt" to setup.py to avoid untrue "unreleased version"
       messages within the control panel

     - Collector #1436: applied patch to fix a memory leak in 
       cAccessControl. 

Updated docutils including a fix for 1426:  System locale breaks reStructuredText horribly
Added rest-language-code to zope.conf schema. it's used instead of the locales

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