TriangulationFactory should also validate if point locations have been modified

[JonasLukasczyk]

While I adjusted the statefiles for ttk-data PR #58 I noticed the following issue:

Imagine the Factory is asked to create an explicit triangulation for a triangulated plane. Currently the triangulation will be identified by the cellArray. However, later the WarpByScalar filter only changes the vertex positions and leaves the cell-array unmodified. So the triangulation still looks at the old vertex positions and other ttk filters will ignore the new vertex positions. In this case the factory should actually create a new triangulation.