Review prop beamlines

[buzmakov]

Try to separate S2E and day1

[samoylv]

1. i.e. rename beamlines
2. spb kb beamline: update elliptical mirror propagators (now in in my_s2e_beamline.py), should be:

    hfm    = wpg.optical_elements.Mirror_elliptical(
                    orient='x',
                    p=distance, 
                    q=(distance_hfm_vfm+distance_foc), 
                    thetaE=theta_kb,
                    theta0=theta_kb,
                    length=0.9 
                    )     
    vfm    = wpg.optical_elements.Mirror_elliptical(
                    orient='y',
                    p=(distance+distance_hfm_vfm), 
                    q=distance_foc, 
                    thetaE=theta_kb,
                    theta0=theta_kb,
                    length=0.9 
                    )     

[CFGrote]

Done in branch update_prop_beamlines

[CFGrote]

See pull request #102