o RooRealVar

    - Improve auto-assignment of initial value of only range
      is given: check explicitly if range is open ended on either
      side: if [-inf,inf] xinit=0, if open-ended on one side only,
      assign the other (finite) boundary as initial value, if closed
      assign midpoint as usual

  o RooRealProxy

    - Make method hasMin() and hasMax() of contents visible


  o RooPoisson

    - Add explicit handling of open-ended range of type [x,inf]
      for normalization integral over observable


git-svn-id: http://root.cern.ch/svn/root/trunk@36848 27541ba8-7e3a-0410-8455-c3a389f83636