remove double move in UpdateSchemeEventDriven which produces duplicated pedestrians in LinkedCellGrid.

improve garbage collection for the meshes, fix bug in walk and jump algorithm, prepare for mesh drawing into a panel for the gui.

Fix #160: In "TikzGenerator.java", use "String.format(Locale.US, ..." to force a dot as decimal separator.

fix wrong minX minY for CellGrid, false in cone walk in ITriConnectivity and use of the wrong EikonalSolver if the type is NONE.

useRandomSpawn=false.

refactoring of the module / package structure: potentialfield calculators are now in the module simulation and the module meshing requires the module utils which is again the module without dependencies. simulation depends on meshing