Release of Karrigell-2.2.1

Karrigell is a powerful Python web framework, with an almost flat learning curve

The changes in this new version are :

- a major speed improvement (up to 60%) by changing some algorithms in the request handler
- changed the directory organization : the home page and all the demos are now in a directory "webapps". This should make the installation on shared hosting services easier
- remove the option 'admin' for allow_directory_listing (not really useful, and made the code confused)
- changes in the wiki and kwiki demos : both support an option that restricts editing to the administrator. Markup options have been added to the wiki (ability to mark zones with a CSS style)
- a tip for Python scripts that musn't be executed in Karrigell : add try: raise SCRIPT_END except: pass
- the database management script generation has been bugfixed ; it is now explained in the documentation shipped with the package and removed from the sourceforge page, where it is replaced by a link to the tutorial

and some bugs fixes, especially in the module HTMLTags