Added an option to model the vapor phase as ideal in activity coefficient Property Packages (NRTL, UNIQUAC, UNIFAC and COSMO-SAC);
Enhanced the Binary Envelope Utility with equilibrium type selection and critical line calculation (T-x-y only);
Enhanced the Pure Comp Property Viewer with Liquid and Solid Density graphs;
Added units to NRTL and UNIQUAC Interaction Parameters input table;
Small bug fixes for improved Mono compatibility.