Display char* excptions when Something Bad happens

When these are raised on osx (and Linux?) the program crashes with no error.
This displays the message in a fatal error box and then quits slightly more
gracefully.

Source/Fractorium/Main.cpp

@@ -44,9 +44,18 @@ int main(int argc, char *argv[])
 	 "}" );
 #endif
 
+	int rv = -1;
+
+	try
+	{
 		Fractorium w;
 		w.show();
 		a.installEventFilter(&w);
-	return a.exec();
+		rv = a.exec();
+	} catch (const char *e) {
+		QMessageBox::critical(0, "Fatal Error", e);
+	}
+
+	return rv;
 }