Displaying Pretty RTL

I did some fixes to the html output option in the various print() functions of Boomerang today. This is all so I can display RTL as pretty as possible. I'm thinking that hovering the mouse over a RefExp should highlight the line that is referenced by it. That's my first goal, and then I'll work on a context menu. All this is possible because I can hide pointers in the html output which refer back to the intermediate representation. Qt4 has the advantage that good html display widgets are standard parts of the toolkit. What I don't intend to do is to allow freeform manipulation of the RTL. That would require an RTL parser, which I'm simply not in the mood to write, at least this month.

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