Small modification 1D_Cathode cases.
directional derivative depending on the definition of first node. Trying to solve it with searching for the right first node but it is very difficult. A solution is required to allow triangular meshes in charged simulations.
New functionality: - DSMC module: - 2D cyl geometry - GMSH file format - Elastic cross-section for Argon-Argon collisions. - Basic boundary conditions: reflection, absorption and axis symmetry. Bugs fixed: Other comments: - Still searching for name.