GRAPH PAINTER UPDATE
new: added graph painter that performs graph colouring (however not perfectly - it sometimes uses more colours than neccessary)
change: hex network generator now requires width no smaller than 2
bugfix: states and visibility in circle network were not drawn correctly after window was resized or right-click-menu was used - it has been fixed
bugfix: in network creator when a popup asking for number of nodes when creating ring network was cancelled, error message was shown - it has been fixed