README: update
all: put the duration and begin into conditions

The duration and begin are now part of a condition. The vpz of vle
packages are updated in order to take into account this new feature.
decision: add parameters to the predicate

- The signature of a predicate accepts a reference to a map of
  value. Now when binding the boolean function to the predicate item,
  you also might need to give a Map of values.
- When Using the plan approach you can concatenate to the name of the
  predicate a string referencing a map of value inside a map. An you
  need to provide to the plan a map of map of values if necessary.
- The syntaxe to specify a predicate parametrized is :
  "pred i cate+parameterMapName"