Trying to fix bug reported by Peter den Bak and Meino Christian Cramer (thanks!):

-- splash screen disappeared (duh, I did that!) and Blender quits upon exiting from some 225 games:

It was troublesome to find how to run demos in general with the screen correctly redrawn before they started, etc.  Ended up making the above error in screenmain().  About the games, I don't have them and will need some time to get the files for testing, but I'll do it, though only on linux.

BPython:
-- Window: added GetScreens, SetScreen and improved GetScreenInfo.
-- Object, NMesh: updated (added in NMesh) method getMaterials to return either only valid materials as before or also empty slots (as None).  This previous omission can be considered a bug, since it made info about materials incomplete / incompatible with face mat indices.  Thanks Yann Vernier for bringing this up and sending/proposing a patch that also fixed a bug related to assigning lists of materials with different lengths to obj and its mesh. setMaterials also accepts Py_None entries now, which become empty slots in Blender.
-- doc updates.

source/blender/python/BPY_interface.c

@@ -908,6 +908,21 @@ static PyObject *ID_asPyObject(ID *id)
 	}
 }
 
+int BPY_has_onload_script(void)
+{
+	ScriptLink *slink = &G.scene->scriptlink;
+	int i;
+
+	if (!slink || !slink->totscript) return 0;
+
+	for (i = 0; i < slink->totscript; i++) {
+			if ((slink->flag[i] == SCRIPT_ONLOAD) && (slink->scripts[i] != NULL))
+				return 1;
+	}
+
+	return 0;
+}
+
 void BPY_do_pyscript(ID *id, short event)
 {
 	ScriptLink *scriptlink = ID_getScriptlink(id);