Calculate qh,qk,ql,en for the pixels in an sqw dataset
>> qw=calculate_qw_pixels(win)
win Input sqw object
qw Components of momentum (in rlu) and energy for each pixel in the dataset
Arrays are packaged as cell array of column vectors for convenience
with fitting routines etc.
i.e. qw{1}=qh, qw{2}=qk, qw{3}=ql, qw{4}=en
% Overloaded methods:
sqw/calculate_qw_pixels
sqw/calculate_qw_pixels