Revert "Set all strings to be unicode when referencing fit.name. This won't catch all conversion errors, but it should catch most. (#1168)"

This reverts commit da33a372cb. Was squashed by mistake, commit author was lost

gui/graphFrame.py

@@ -248,8 +248,8 @@ class GraphFrame(wx.Frame):
                 self.subplot.plot(x, y)
                 legend.append(fit.name)
             except:
-                pyfalog.warning(u"Invalid values in '{0}'", fit.name)
-                self.SetStatusText(u"Invalid values in '%s'" % fit.name)
+                pyfalog.warning("Invalid values in '{0}'", fit.name)
+                self.SetStatusText("Invalid values in '%s'" % fit.name)
                 self.canvas.draw()
                 return