Dispersal model removed if dispersal rate = 0 at first generation

[frederic-michaud]

If the dispersal rate is set to 0 at the first generation (but we want to increase it in the future), no dispertion seems to happen

folder	 	fitness_landscape_various_patch/logo_fr	 	
generations	 	61	 	
patch_number	 	12100	 	
patch_capacity	 	100	 	
quanti_loci	 	100	 	
quanti_all	 	2	 	
quanti_selection_model	 	3	 	
quanti_save_phenotype	 	1	 	
quanti_allelic_file	 	allelicFile.txt	 	
dispersal_model	 	3	 	
dispersal_border_model	 	1	 	
dispersal_lattice_dims	 	{121 100}	 	
dispersal_rate	 	(1 0, 20 0.01,40 0.1, 60 0.5 )	 	
quanti_fitness_landscape	 	$landscape.txt	 	
quanti_phenotype_landscape 	 	$phenotype.txt	 	

[frederic-michaud]

@sneuensc , do you know if this line is just an optimisation trick that can be removed?

quantinemo/src/lce_disperse.cpp

Line 1893 in 2fc9a2e

migration_func_ptr = &LCE_Disperse::migrate_zeroMigration;

[frederic-michaud]

This is actually working, it's only the log file which doesn't show the correct behaviour. Thanks @sneuensc for the tip.
I still leave it open since the log file should be better, but this would require more work.