reconstruct_expe for DCNet

[jabascal]

Exception has occurred: AttributeError
'SplitPoisson' object has no attribute 'gain'
File "/home/abascal/Projects/openspyrit/spyrit/spyrit/core/prep.py", line 381, in sigma_expe
self.gain * (x - 2 * self.nbin * self.mudark)
^^^^^^^^^
File "/home/abascal/Projects/openspyrit/spyrit/spyrit/core/recon.py", line 778, in reconstruct_expe
var_noi = self.prep.sigma_expe(x)
^^^^^^^^^^^^^^^^^^^^^^^
File "/home/abascal/Projects/openspyrit/spyrit-examples/tutorial/fig_recon_sim_prelim.py", line 473, in
rec_gpu = model.reconstruct_expe(m)
^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'SplitPoisson' object has no attribute 'gain'

[jabascal]

To try also https://github.com/openspyrit/spyrit-examples/blob/master/2022_OE_spyrit2/fig8_recon.py