Refactoring -- use stl for_each in expr visitors
Refactoring -- use stl for_each in expr visitors

bgarrels/zorba,28msec/zorba,cezarfx/zorba,cezarfx/zorba,bgarrels/zorba,28msec/zorba,cezarfx/zorba,bgarrels/zorba,cezarfx/zorba,cezarfx/zorba,bgarrels/zorba,28msec/zorba,cezarfx/zorba,28msec/zorba,28msec/zorba,28msec/zorba,cezarfx/zorba,cezarfx/zorba,cezarfx/zorba,bgarrels/zorba,cezarfx/zorba,bgarrels/zorba,bgarrels/zorba,28msec/zorba,28msec/zorba,bgarrels/zorba,28msec/zorba