Make jfreechart availabe from statistics site
Merge pull request #6 from KlasJoenssson/Debugging

Bugfixes for the chart plug-in.
Some more bugfixes.

* Updates to the help pages
* Changes the standard XY-plot title to "y against x"
* Make the size of the boxes i the box plot never to be lager than 30% of the chart area
* Some more small bug fixes