First part for the new tool.
Removed unneccessary assertion in AABB constructor
Initial commit convertPolylineToVerticalPolygon.

The tool was transfered from OGS-5 to OGS-6. It is useful only for layered meshes.
Using TCLAP for parsing command line args.
Using logog logging in convertPolylineToVerticalPolygon.
Experimenting with search length.
Added convertPolylineToVerticalPolygon to qt-sect.

Added convertPolylineToVerticalPolygon to qt-section to use xml functionality.
Generating the surface and write it as xml out.
Added checks if at least one mesh node is found.
Insert surface only into vector if algorithm created a corresponding polygon.