Use a button to toggle between firepower/miningyield

Introduce a button on both firepowerViewFull and miningyieldViewFull
views that allows switching between the two. Work by destroying each
view and recreating/populating on every button press.

gui/statsPane.py

@@ -30,7 +30,7 @@ import gui.globalEvents as GE
 class StatsPane(wx.Panel):
     DEFAULT_VIEWS = ["resourcesViewFull", "resistancesViewFull" ,"rechargeViewFull", "firepowerViewFull",
                      "capacitorViewFull", "targetingmiscViewFull",
-                     "priceViewFull", "miningyieldViewFull"]
+                     "priceViewFull",]
 
     def fitChanged(self, event):
         cFit = service.Fit.getInstance()