Bayes LOSVD fluxes fix

[maindlt]

Fix a crash when creating the BayesLOSVD kinematics file in rare cases where the completed bins were determined incorrectly.

Here is what happened in method BayesLOSVD.write_losvds_to_ecsv_format():

• The input file (hdf5) is read into dictionary result, assuming that the completed bins are associated to the dictionary keys with type integer (completed_bins = [i for i in result.keys() if type(i) is int]).
• Later in the code, the data is put into an astropy table data that has length len(completed_bins) and the statement data['bin_flux'] = result['bin_flux'] is used to assign the fluxes from the hdf5 file to the table. While this works for most users, in at least one case this statement failed with error "Inconsistent data column lengths".
• Diagnosis: in that particular case, there was a discrepancy between len(completed_bins) and the number of entries in result['bin_flux'].
• Solution: Accepting only result['bin_flux'] entries that actually correspond to a valid completed_bins entry worked for this case, so the proposed solution is to replace the violating assignment data['bin_flux'] = result['bin_flux'] by including it in the for loop starting in line 1056. This ensures that only result['bin_flux'] values that actually correspond to a completed_bins entry are copied.

Testing: tested with tutorial '4. BayesLOSVD and DYNAMITE'.

@liquidreams: Can you confirm that this solution works for you? As far as I remember you implemented it locally a while ago. @prashjet: would be great if you had a look at the code ;-)

Closes #360.

Cheers, Thomas

[maindlt]

Many thanks, Prash! I will merge and delete branch then :-)