added Gene.remove_mrnas_from_list
added Sequence.remove_genes_from_list()
extra test case for seq.remove_genes_from_list
added Sequence.remove_mrnas_from_list (just calls it on child genes)
added ConsoleController.remove_from_list
added ConsoleController.read_remove_file and .remove_from_file
you can remove from file
remove from file now prints names of removed features to stderr