public static SimpleTaskExecution of (TaskExecution aSource) {
    return new SimpleTaskExecution(aSource);
  }
Creates a mutation {@link SimpleTaskExecution} instance which 
is a copy of a {@link TaskExecution}.

@param aSource
         The {@link TaskExecution} instance to copy.
@return the new {@link SimpleTaskExecution}
src/main/java/com/creactiviti/piper/core/task/SimpleTaskExecution.java