Using the tol (tolerance) variable makes the code more readable.

The until now implementation is not correct. Using
Polygon::isPolylineInPolygon(), which is tested already.

Method will be used later on to check if a polyline is within the polygon.

Conflicts:
	GeoLib/AnalyticalGeometry.cpp

new command line tool "generateStructuredMesh"

add missing includes in TemplateVec

New tool "appendLinesAlongPolyline"

PETSc linear solver class

Add FEFLOW import

fix a bug that unused nodes were not removed in a new extracted mesh.

GUI surface integration for source terms

Remark: The Travis CI build fails, because one test for reading and writing xml files fails in one configuration. This happens sometimes. Since this PR doesn't touch xml functionality I merge it although Travis CI is failing.