c057d098de
INTERPOLATION - add subroutine expand_1d_tvd to 1D TVD prolongation; - implement magnetic field boundary prolongation with a given boundary; this is used for boundary update of magnetic components in a block at higher level, where the boundary is updated from the block at lower level; the prolongation is divergence free; for now only 2D case is implemented; BOUNDARY CONDITIONS - use the boundary prolongation subroutine expand_mag_bnd in the updating the magnetic field boundaries in a blocks which neighbors are at lower level; this should be ready for 3D too;