Using the removed constructor was insecure because there was neither a
compile time check nor a run time check if the size of the C array holds
enough data.

Cleanup

Using other Point constructors

[GL] Fix bug in lineSegmentIntersect.

Using std::array-constructor version of Point3dWithID, which is the base class of Node.

[A] Initialize lis.

The special case where the line segments (a,b) and (c,d) are parallel but are not
located at the same straight line was not handled properly. This led to a
singular matrix and to a not a number solution. This commit fixes the
handling of the special case.

[NL] Fix possible alignment issues with eigen.

Fix memory leaks in tests

Fix memory leaks geo lib tests

This avoids the memory leaks described in ufz/ogs#728, but does not resolve the issue.

See http://eigen.tuxfamily.org/dox/group__TopicStructHavingEigenMembers.html for details.

[A/U] GMSH2OGS: Add nullptr check.

[MGTL] Fix MeshNodeSearchers memoization due to changed mesh_id.