wta: Add out-degree parameter to 'run' command

This just multiplies `--out-degree` with `--states` to compute the transitions
parameter and thus makes it easier to execute the `run` command with the same
parameters as `bisect`

wta/bench.py

@@ -171,6 +171,8 @@ def print_row(d, header, stddev):
 
 def run(args):
     check_zerotrans(args)
+    if args.out_degree:
+        args.edge_spec = ("transitions", str(int(args.out_degree)*int(args.states)))
 
     results = [run_one(args, i) for i in range(0, samples)]
 
@@ -277,6 +279,7 @@ def main():
     run_parser.add_argument('--symbols', required=True)
     run_parser.add_argument('--zero-frequency')
     run_parser.add_argument('--transitions')
+    run_parser.add_argument('--out-degree')
     run_parser.add_argument('--different-values')
     run_parser.add_argument(
         '--stddev', action='store_true', help="report stddev for timings")