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

In "README.md", extended description in section "IntelliJ IDEA" to avoid compilation errors described in #120.

Fix #120 Problems with Annotation processing and code generation in Intelj