cyclus/cyclus — pull request #656 by gidden (2013-12-10 16:49:22+00:00)
Title: tweaked the error class to have its message tweaked by models and provid...

...ed models and interface for doing so.

I would now do something like:

```
.. in a facility member function somewhere

try {
// some things..
} catch(cyclus::Error& e) {
e.msg(Model::InformErrorMsg(e.msg());
throw e;
}
```

```