[selling] added shipping rule link besides taxes master link field

selling/doctype/quotation/quotation.txt

@@ -2,7 +2,7 @@
  {
   "creation": "2013-05-24 19:29:08", 
   "docstatus": 0, 
-  "modified": "2013-06-19 15:55:15", 
+  "modified": "2013-06-27 11:31:49", 
   "modified_by": "Administrator", 
   "owner": "Administrator"
  }, 
@@ -420,7 +420,7 @@
   "fieldname": "charge", 
   "fieldtype": "Link", 
   "hidden": 0, 
-  "label": "Sales Taxes and Charges", 
+  "label": "Apply Taxes and Charges Master", 
   "oldfieldname": "charge", 
   "oldfieldtype": "Link", 
   "options": "Sales Taxes and Charges Master", 
@@ -434,11 +434,12 @@
  }, 
  {
   "doctype": "DocField", 
-  "fieldname": "get_charges", 
-  "fieldtype": "Button", 
+  "fieldname": "shipping_rule", 
+  "fieldtype": "Link", 
   "hidden": 0, 
-  "label": "Get Taxes and Charges", 
+  "label": "Apply Shipping Rule", 
   "oldfieldtype": "Button", 
+  "options": "Shipping Rule", 
   "print_hide": 1, 
   "read_only": 0
  },