Package TWiki::UI::RDiff 
UI functions for diffing.
 StaticMethod diff ($session,$web,$topic,$query) 
diff command handler.
This method is designed to be
invoked via the 
UI::run method.
Renders the differences between version of a 
TwikiTopic
| topic | topic that we are showing the differences of | 
| rev1 | the higher revision | 
| rev2 | the lower revision | 
| render | the rendering style {sequential, sidebyside, raw, debug} | (preferences) DIFFRENDERSTYLE, sequential | 
| type | {history, diff, last} history diff, version to version, last version to previous | history | 
| context | number of lines of context | 
| skin | the skin(s) to use to display the diff | 
TODO: 
-  add a {word} render style
-  move the common CGI param handling to one place
-  move defaults somewhere