@author Benedikt Zoennchen Abstract class that solves the eikonal equation on a Mesh i.e. 2-D triangular mesh. It is the basis for the implementation of the FMM, FIM, FSM and IFIM on triangular meshes. @author Benedikt Zoennchen @param the type of the vertices of the triangulation @param the type of the half-edges of the triangulation @param the type of the faces of the triangulation