Backend: head comment is now generic and does not include application name...

... that was a bad idea as dpkg files can be written with 'cme edit dpkg'
or 'cme edit dpkg-control'. Hence the header would change depending
on the cme command used. Bad idea.
v2.046

    * cme:
      + added -create option to force creation of missing configuration
        file
      * improved message about applied changes and don't show '0' as <undef>
      * added examples in pod doc
    * BackendMgr:
      + add note about cme in header of saved file (if comments
         are supported in the configuration file format)
      * Improved error message when no config file is found
      * skip backup copy if no original file is found
    * Node: avoid unknown element failure when check is 'no'
    * ValueComputer:
      * added note in doc about compute variable usage
      * correctly handles &index(-x) where x is a number > 1
      * improved error message if 'follow' parameter does not point to
        a leaf in configuration tree
    * overdue doc changes: s/WarpedThing/Warper/g in pod docs