A little bit input validation

	'debug'     => \$debug,

);

unless (@to == 2 and @from == 2) {

	print STDERR "Usage: efa --from <city> <stop> --to <city> <stop> [other options]\n";

	exit(1);

}

@post{'place_origin','name_origin'} = @from;

@post{'place_destination','name_destination'} = @to;