* [IOTW,SC] Added an external method for building nodes. (Less code, better modularity).
* [IOTW,NEW] Add the accuracy of the rough identity set in the graph label.
* [IOTW,EXT] Output GraphViz representations of rough sets to PNG and JPG as well (besides PDF and SVG).
Merge branch 'master' of https://github.com/wouterbeek/IOTW
Applied changes based on the conversation by Frank to the first half of the paper.