Item8315: CompareRevisionsAddOn should set "diff" context for the compare script

Because the compare script is a replacement for the rdiff/rdiffauth scripts, the switchboard entry should set the "diff" context so that plugins can determine what type of processing to perform.

See also Item8314. The DirectedGraphPlugin needs to avoid rendering graphs for the comparison views of topics.

-- GeorgeClark - 30 Oct 2009

Current Switchboard entry

$Foswiki::cfg{SwitchBoard}{compare} = [
          'Foswiki::Contrib::CompareRevisionsAddOn::Compare',
          'compare',
          {
            'comparing' => 1
          }
        ];

--+++ proposed update to latest style

$Foswiki::cfg{SwitchBoard}{compare} = {
    package  => 'Foswiki::Contrib::CompareRevisionsAddOn::Compare',
    function => 'compare',
    context  => { diff => 1,
                  comparing => 1
                },
    };

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