Busy with the documentation!
Added FITS image of example images.

Continuing with the documentation.
Parameter one for all profiles is now
the radial parameter. I done this to be
more understandable.

The truncation radius of the functional PSFs
was changed to 10 times the radial parameter
(FWHM/2 for Moffat and sigma for Gaussian).

The sample image was changed (since with the
new truncation radius, the blur is more
significant).