erp5_stock_cache: Allow easy stock cache disabling.

Disable stock cache by removing erp5_syock_cache from skin selection.

bt5/erp5_stock_cache/CatalogMethodTemplateItem/portal_catalog/erp5_mysql_innodb/SQLCatalog_trimInventoryCacheOnCatalog.xml

@@ -52,6 +52,10 @@
             <key> <string>_body</string> </key>
             <value> <string>from Products.ERP5Type.Errors import ProgrammingError\n
 \n
+zTrimInventoryCacheFromDateOnCatalog = getattr(context, \'SimulationTool_zTrimInventoryCacheFromDateOnCatalog\', None)\n
+if zTrimInventoryCacheFromDateOnCatalog is None:\n
+  return\n
+\n
 min_date = None\n
 for loop_item in xrange(len(uid)):\n
     if not isInventoryMovement[loop_item] and isMovement[loop_item] and getResourceUid[loop_item]:\n
@@ -67,7 +71,7 @@ for loop_item in xrange(len(uid)):\n
                 min_date = getStartDate[loop_item]\n
 \n
 try:\n
-    context.SimulationTool_zTrimInventoryCacheFromDateOnCatalog(uid_list=uid, min_date=min_date)\n
+    zTrimInventoryCacheFromDateOnCatalog(uid_list=uid, min_date=min_date)\n
 except ProgrammingError:\n
     # Create table if it does not exits\n
     # Then no need to flush an empty table\n

bt5/erp5_stock_cache/CatalogMethodTemplateItem/portal_catalog/erp5_mysql_innodb/SQLCatalog_trimInventoryCacheOnUncatalog.xml

@@ -52,8 +52,12 @@
             <key> <string>_body</string> </key>
             <value> <string>from Products.ERP5Type.Errors import ProgrammingError\n
 \n
+zTrimInventoryCacheFromDateOnUncatalog = getattr(context, \'SimulationTool_zTrimInventoryCacheFromDateOnUncatalog\', None)\n
+if zTrimInventoryCacheFromDateOnUncatalog is None:\n
+  return\n
+\n
 try:\n
-    context.SimulationTool_zTrimInventoryCacheFromDateOnUncatalog(uid=uid)\n
+    zTrimInventoryCacheFromDateOnUncatalog(uid=uid)\n
 except ProgrammingError:\n
     # Create table if it does not exits\n
     # Then no need to flush an empty table\n