RooSimultaneous

 Constructor from index category. PDFs associated with indexCat
 states can be added after construction with the addPdf() function.
 
 RooSimultaneous can function without having a PDF associated
 with every single state. The normalization in such cases is taken
 from the number of registered PDFs, but getVal() will assert if
 when called for an unregistered index state.

 Constructor from index category and full list of PDFs. 
 In this constructor form, a PDF must be supplied for each indexCat state
 to avoid ambiguities. The PDFS are associated in order with the state of the
 index category as listed by the index categories type iterator.

 PDFs may not overlap (i.e. share any variables) with the index category

 Copy constructor

 Destructor

 Retrieve the proxy by index name

 Associate given PDF with index category state label 'catLabel'.
 The names state must be already defined in the index category

 RooSimultaneous can function without having a PDF associated
 with every single state. The normalization in such cases is taken
 from the number of registered PDFs, but getVal() will assert if
 when called for an unregistered index state.

 PDFs may not overlap (i.e. share any variables) with the index category

 Return the current value: 
 the value of the PDF associated with the current index category state

 Return the number of expected events:
 If the index is in nset, then return the sum of the expected events of all components,
 otherwise return the number of expected events of the PDF associated with the current index category state

 Distributed integration implementation

 Return analytical integral defined by given scenario code

 New experimental plotOn() with varargs...

 Constructors, assignment etc