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SortHelper refactoring:

* multiple columns sort feature (#2871)
* CSS classes instead of an image tag to reflect the state of the column
* examples fixed (#2945)

Authored by: jplang 2009-03-10

Parent: [r2570]

changed	/trunk/app/helpers/sort_helper.rb
changed	/trunk/public/stylesheets/application.css
added	/trunk/test/unit/helpers/sort_helper_test.rb