Remove file extension from breadcrumb

Hello Wari,

I'm not fond of the ".txt" extension in the breadcrumb, since that's not at 
all what is served -- even if it contained "html", I prefer not to have 
file extensions in my URIs.

The last line of the following code fragment removes the extension:

    def littleCrumbs(self):
        conf = self._request.getConfiguration()
        data = self._request.getData()

        path = string.replace(data['root_datadir'], conf['datadir'], '')
        path = os.path.splitext(path)[0]



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