Files in this directory are for use as zope external methods. To install
one of these, in the ZMI add an External Method with::

 id:       anything, eg the filename without suffix
 title:    
 module:   ZWiki.modulename (modulename is filename without suffix)
 function: the name of the file's main function

It may be necessary, with certain older zope versions, to copy the file to
the Extensions subdirectory in your INSTANCE_HOME (or your main zope
directory). Then it's just module: modulename.
