Reza discovered a bug within the gauss elimination.

This tool reads a matrix, and solves a simple system of linear equation.

[GeoLib] Corrected implementation of check if Polyline is in Polygon.

GeoLib Triangle bug fix

Rework class SimplePolygonTree in GeoLib

Using pre increment to omit a copy.

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

Renamed and slightly modified algorithm to make it more readable.

Impl. a new algorithm for checking if a point is within a triangle and removed old sources for this task.

std::list::erase pre C++11 implementation does not take a const iterator. This commit can be reverted if Travis uses a newer version of gcc.