Correctly import printcore in pronsole and pronterface

pronsole.py

@@ -21,7 +21,7 @@ import sys, subprocess
 import math, codecs
 from math import sqrt
 
-from printrun import printcore
+import printcore
 from printrun.printrun_utils import install_locale
 install_locale('pronterface')
 

pronterface.py

@@ -42,8 +42,8 @@ if os.name=="nt":
     except:
         pass
 
-
-from printrun import printcore, gviz
+import printcore
+from printrun import gviz
 from printrun.xybuttons import XYButtons
 from printrun.zbuttons import ZButtons
 from printrun.graph import Graph