o RooGlobalFunc

    - Extend named argument RenameConflictNodes with optional Boolean argument to rename existing objects
      rather than to-be-imported objects

  o RooCustomizer

    - Modify behavior of build() such that when masterState is null, or when the name of the customizer
      is an empty string that no suffix is added to the customized branch nodes

    - In the workspace factory interface, modify behavior such that in case the new instance name and
      the original top-level node name are identical that the customizer is run in the new null-name
      mode. This customized tree expression with modified branch objects is subsequently imported
      into the workspace with the RenameConflictNodes("orig",1) to rename the original branch names
      in the workspace. In this mode, also clear the factory_tag attribute of any customized object
      as to not trigger any node recycling based on a false equivalency condition on the factory tag

  o RooWorkspace

    - Support new option RenameConflictNodes(suffix,Bool) in import() so that when Bool=true, the
      existing nodes in the WS are renamed with a '_suffix' suffix instead of the to-be imported nodes.
      In case nodes with <nodename>_<suffix> already exist, rename to <nodename>_<suffix>_<n>
      where <n> is the lowest integer value >=1 that results in a unique name