[GeoLib] Impl. of computeAndInsertAllIntersectionPoints().
[GeoLib] Test for GeoLib::computeAndInsertAllIntersectionPoints().
[FileIO] Using GeoLib::computeAndInsertAllIntersectionPoints().
[GeoLib] Polygon test: isPolylineInPolygon().
[GeoLib::Polygon] getAllIntersectionPoints().
[GeoLib::Polygon] Impl. of containsSegment().

Method will be used later on to check if a polyline is within the polygon.
[GeoLib] Tests for Polygon::containsSegment().
md Removed computeIntersectionPoint().
[GeoLib::SimplePolygonTree] Using isPolylineInPolygon().

The until now implementation is not correct. Using
Polygon::isPolylineInPolygon(), which is tested already.
[GeoLib] Restructured and fix bug in isPointInTriangle code.

Impl. a new algorithm for checking if a point is within a triangle and removed old sources for this task.
[GeoLib::Triangle] Using existing code for containsPoint().
[GeoLib] Tests for isPointInTriangle().
[GeoLib] getOrientedTriArea() -> calcTriangleArea().

Renamed and slightly modified algorithm to make it more readable.
[MeshLib/NumLib] MathLib::calcTriangleArea() -> GeoLib::calcTriangleArea().
[MathLib] Remove twice implemented functionality.