Refactored theming.
Changed look and feel so that content operation links are no longer part of a message but appear as submenu links.
Added CSS classes en templates (rather than theming functions) to facilitate further customisation.
o Added link to compare revisions when Diff module is enabled
o revisioning_node_api() will no longer intercept URI's that don't start with "/node/%"
o Don't show 'Show all revisions' link when Revisions tab is also visible
Only display content info when NO teaser is requested via hook_node_api('view').
Fixed broken link shown in watchdog message when trigger is invoking action.
Added German translations and .pot file.
