Provides an SPI for creating a diff between two page versions.
A seriously better diff provider, which highlights changes word-by-word using CSS.
Load, initialize and delegate to the DiffProvider that will actually do the work.
If there is no diff provider set, this provider will work instead.
This DiffProvider allows external command line tools to be used to generate the diff.
This is the JSPWiki 'traditional' diff.
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