Ouput improvement suggestions

[maurelian]

1. Add linecounts after source unit names, and a total at the end (similar to the output of scope contracts/**/*.sol)
2. Risk and Source lines: I think a simple bar chart would be easier to read for both. I especially hate the pie charts though. :)
3. Add the Surya Fancy Graphs
4. Risk: Document the meaning of "Per Source Unit" measurements
5. Exposed functions section: add 'external', 'internal', 'private' counts.
6. Add a count of mutating functions (ie. pure, view, payable, n/a)

[tintinweb]

was addressed in the re-write (pie charts still there but they're easy to remove)