[GeoLib] Tests for GeoLib::lineSegmentIntersect().
[FileIO] GMSHInterface::writeGMSHInputFile() Move centroid to origin.
[GMSH] Included AnalyticalGeometry.h into GMSHPolygonTree.
[GeoLib] Check if two 3d vectors are parallel.
[MathLib] No constructor for 3 values -> need initializer list.
[GeoLib] Changed check of line seg. intersection.