add authors
code cleanup, make Gtk.Plotsurface.cs better comparable
add PhysicalAxes porperties and access to inner PlotSurface
typo
change folder structure, fix Makefile
fix assembly signing
use gtk-dotnet library for Gdk <-> System.Drawing conversions
add static default fonts for all Nplot classes (workaround for strange libgdiplus crashes)
add IPlot.Color property, so all plots ensure to have a defined color or throw an exception
image plot throws an exception for IPlot.Color
add RectangleF.RoundCorners() extension to add round corners to rectangles
add a grid scale division class, which shows a difference between grid lines (by Malte Klapper)