py3: Material: print to python3

taken from: 23fa650261ed346b2c5a6216b7720b87e063b27d
author: kkremitzki

Update Arch,Fem,Material,Spreadsheet for py3 print

src/Mod/Material/MaterialEditor.py

@@ -19,6 +19,7 @@
 #*   USA                                                                   *
 #*                                                                         *
 #***************************************************************************
+from __future__ import print_function
 
 import FreeCAD, FreeCADGui, os
 from PySide import QtCore, QtGui, QtUiTools, QtSvg
@@ -248,7 +249,7 @@ class MaterialEditor:
             try:
                 import DrawingPatterns
             except:
-                print "DrawingPatterns not found"
+                print("DrawingPatterns not found")
             else:
                 pattern = DrawingPatterns.buildFileSwatch(pattern,size=96,png=True)
                 if pattern: