Added 5 images for testing the SR-EELS calibration:

Recording date: 04.12.2013
Binning: 2 (30 µm/px)
SpecMag: 100 (dispersion: 0.1333334 eV/px)
QSinK7: 0
Implemented a GUI version of image_preprocess:
Finished a draft version of the SR-EELS preprocessing und calibration GUI:

1. Preprocessing
    a) Open images and select if they were recorded by a TVIPS camera
    b) Set the binning for the y-axis (energy-axis)
    c) Set the kernel size for the median filter
    d) Run the preprocessing
    e) Switch to the calibration setup
2. Calibration
    a) Open images (automatically if preprocessing has been used)
    b) Set the polynomial order for the aperture border fit
    c) Set the polynomial orders for the distortion fit
    d) Run the calibration
    e) View the calibration results

remark: The example images show the carbon k-edge at 284eV. A SepcMag of 125 and no modification at Energy Filter Align were used.