When expanding hydroclimate scenarios, check to make sure we're doing forecasts

```
User can select multiple realizations on Hydroclimate dashboard, then switch 
back to a historical hydrology run.

Need to modify some of the FileAction methods so that it confirms that a 
climate change scenario is called for before expanding


```

Original issue reported on code.google.com by `Tad.Slawecki@gmail.com` on 23 Dec 2013 at 5:52
