added haplotype handling, and option to specify if there are haplotypes and what haplotypeto use from the source genome

segment coorinates of target genomes are no longer computed when the user only asks for the graph annotation (option -gaf ou -gff), only the source genome is computed

added the conversion of path lines in walk format to be read by grannot. the path name must be #assembly_name#haplotype#sequence_name, for instance IRGSP#1#Chr1

adapted the code to do a transfer on several genomes, by clearing the features target genome paths between each genome