Changed setup.py
Implemented assertion to check if jacobi matrix is the same

test: changed the dataloader TestCase
pyramex: first experiments with Cython and SCons
dataloader: changed the order in which the dimensions are saved,
        z_len is no longer part of the magnetization (this was the reason why
        we had to divide by res, which is equal to z_len for calculating coeff)
magcreator: shapes are now separate functions, mag_shape is now an argument for
        one unified create_hom_mag-function
phasemap: unification of the phasemap-functions in real space (just the pixel-
        field is calculated different now)