Add copyright header to setup.py

setup.py

 #!/usr/bin/env python
 
+# This file is part of the Printrun suite.
+# 
+# Printrun is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+# 
+# Printrun is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with Printrun.  If not, see <http://www.gnu.org/licenses/>.
+
 import sys, os, glob
 import subprocess
 from stat import *