Fix error when executing python code under python 3

Author: nyalldawson

python/console/console_editor.py

@@ -594,7 +594,7 @@ def runScriptCode(self):
                 tmpFile = self.createTempFile()
                 filename = tmpFile
 
-            self.parent.pc.shell.runCommand(u"execfile(u'{0}'.encode('{1}'))"
+            self.parent.pc.shell.runCommand(u"exec(open(u'{0}'.encode('{1}')).read())"
                                             .format(filename.replace("\\", "/"), sys.getfilesystemencoding()))
 
     def runSelectedCode(self):

src/app/qgisapp.cpp

@@ -5145,7 +5145,7 @@ void QgisApp::runScript( const QString &filePath )
 
   mPythonUtils->runString(
     QString( "import sys\n"
-             "execfile(\"%1\".replace(\"\\\\\", \"/\").encode(sys.getfilesystemencoding()))\n" ).arg( filePath )
+             "exec(open(\"%1\".replace(\"\\\\\", \"/\").encode(sys.getfilesystemencoding())).read())\n" ).arg( filePath )
     , tr( "Failed to run Python script:" ), false );
 }