new functions:

- void ExperimentSettings::EnableSideWallBreakingInYAndZ()
        - selfexplaining

- Real ExperimentSettings::Insert_Tilted_Overlapping_Rift_Segments(Real distance, Real overlap, Real depth)
        - inserts two rift nuclei, which are tilted with respect to the x-axis
        - paramters are the required distance and overlap of the rifts
        - returns the tilt-angle

- void Deformation::Arbitrary_Uniaxial_Extension(Real angle, Real du)
        - uniaxial extension along a line with an angle to the x-axis