[CCPPETMR/SIRF] FBP2D clean-up (#171)

[Kris Thielemans]

@evgueni-ovtchinnikov, this all works fine. thanks!

Could you rename set_alpha_ramp to set_alpha_cosine_window? Add some doc for the class like:

This is an implementation of the 2D FBP algorithm. 

Oblique angles in data will be ignored. The exception is the span=1 case, where the ring differences +1 and -1 are first combined to give indirect sinograms.

By default, the algorithm uses the ramp filter. An apodizing filter can be added by using set_alpha_cosine_window and/or set_frequency_cut_off. The apodizing filter in frequency space has the form
   (alpha + (1 - alpha) * cos(pi * f / fc))

Add doc to set_alpha_cosine_window

Set alpha in the apodizing filter.

See the class documentation for the filter. alpha should be between 0.5 and 1. alpha=0.5 corresponds to the Hann filter, while 0.54 corresponds to the Hamming filter.

and for set_frequency_cut_off

Set the cut-off frequency for the apodizing filter.

See the class documentation for the filter. fc should be between 0 and 0.5.

Could you then expose this to matlab as well?

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[evgueni-ovtchinnikov]

Closed #171 via 887f19a.