Allow for multiple data sections

[yozw]

Allow for multiple data sections

[yozw]

Change the menu structure to something like this: (from Jeff's email)

Documentation
Model
Data
    Scenario 1  
    * Scenario 2 (star indicates the currently active scenario)
Results
    Dashboard   (problem summary, including solver status)
    Output      (explicitly programmed user output)
    Variables   (Generic like I have now in mathprog)
    Constraints (Report like I have now)
Log messages    (minus Output above)

[yozw]

Results part is done. Data part still to be done.