class_docstr: max of n of scipy.stats normal expon ...
  Example:
      maxnormal10 = RVmax( scipy.stats.norm, 10 )
      sample = maxnormal10( size=1000 )
      sample.cdf = cdf ^ n,  ppf ^ (1/n)
code: def __init__(self, dist, n):
      self.dist = dist
      self.n = n
      extradoc = (
          "maximumdistribution is the distribution of the "
          + "maximum of n i.i.d. random variable"
      )
      super().__init__(
          name="maxdist",
          a=dist.a,
          b=dist.b,
          longname="A maximumdistribution",
          # extradoc = extradoc
      )
  
imports: from scipy import stats
label_desc: Use image node_id 1 to create a new MaxDist object from inherited base classes: stats with example: obj = MaxDist(dist, n)