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) {

source/blender/src/buttons_script.c

@@ -322,7 +322,7 @@ static void  script_panel_scriptlink(void)
 
 	uiDefButBitI(block, TOG, G_DOSCRIPTLINKS, REDRAWBUTSSCRIPT,
 			"Enable Script Links", xco, 200, 150, 20, &G.f, 0, 0, 0, 0,
-			"Enable execution of all assigned Script links");
+			"Enable execution of all assigned Script links amd Space Handelers");
 	/* for proper alignment: */
 	uiDefBut(block, LABEL, 0, "",	160, 200,150,20, NULL, 0.0, 0.0, 0, 0, "");