w is now a real and follows the rules:

- [0..1]: defines a percentage of limit loop where the kappa is not
  used. For example -p w:0.5 -p limit:100 gives 50 loop without kappa
  computation and 50 with kappa computation.

- > 1: defines a static number of loop without kappa computation. For
  examples -p w:50 -p limit:-1 gives 50 loop without kappa and +oo with
  kappa computation.