Distribution-class: Class "Distribution"
Description
 The Distribution-class is the mother-class of 
class UnivariateDistribution.Objects from the Class
Objects can be created by calls of the form new("Distribution").Slots
    - img
- Object of class "rSpace": the space of the image
- param
- Object of class "OptionalParameter": the parameter
- r
- Object of class "function": generates random numbers
- d
- Object of class "OptionalFunction": density function
- p
- Object of class "OptionalFunction": cumulative 
    distribution function
- q
- Object of class "OptionalFunction": quantile function
- .withArith
- logical: used internally to issue warnings as to 
            interpretation of arithmetics
- .withSim
- logical: used internally to issue warnings as to 
          accuracy
- .logExact
- logical: used internally to flag the case where 
    there are explicit formulae for the log version of density, cdf, and 
    quantile function
- .lowerExact
- logical: used internally to flag the case where 
    there are explicit formulae for the lower tail version of cdf and quantile 
    function
- Symmetry
- object of class "DistributionSymmetry";
     used internally to avoid unnecessary calculations.
Methods
    - img
- signature(object = "Distribution"): returns the space of 
                 the image
- param
- signature(object = "Distribution"): returns the 
                 parameter
- r
- signature(object = "Distribution"): returns the random 
              number generator
- d
- signature(object = "Distribution"): returns the density 
              function
- p
- signature(object = "Distribution"): returns the cumulative 
              distribution function
- q
- signature(object = "Distribution"): returns the quantile 
                function
- .logExact
- signature(object = "Distribution"): returns slot- .logExactif existing; else tries to convert the object to a newer 
      version of its class by- conv2NewVersionand
      returns the corresponding slot of the converted object.
- .lowerExact
- signature(object = "Distribution"): returns slot- .lowerExactif existing; else tries to convert the object to a 
       newer version of its class by- conv2NewVersionand
     returns the corresponding slot of the converted object.
- Symmetry:
- returns slot Symmetryif existing; else
    tries to convert the object to a 
       newer version of its class byconv2NewVersionand
     returns the corresponding slot of the converted object.