v2.0.0

Added heuristic algorithm backend - LKH (http://webhotel4.ruc.dk/~keld/research/LKH/)

Repeat nodes now support multiple repeats in a row + added ability to ban specific CPs from repeating.

Changed file output writing - now it appends data after each new candidate solution was found, instead of doing so at the end. The only downside is that this list has to be sorted manually, however the list shown in the GUI interface remains sorted.

Removed legacy output format

Removed command line interface