Made space handelers check that G_DOSCRIPTLINKS is enabled before running.

Its scary to think that a redraw space handeler could run
  import os
  os.system('rm -rf ~/')
removing all user files, Just by opening the blend file!

This means at least you can opt not to run any python scripts you dont want to..

source/blender/python/BPY_interface.c

@@ -1247,9 +1247,9 @@ int BPY_do_spacehandlers( ScrArea *sa, unsigned short event,
 {
 	ScriptLink *scriptlink;
 	int retval = 0;
-
-	if (!sa) return 0;
-
+	
+	if (!sa || !(G.f & G_DOSCRIPTLINKS)) return 0;
+	
 	scriptlink = &sa->scriptlink;
 
 	if (scriptlink->totscript > 0) {