Store and Forward PendingRecords tag for Local Storage

Looks like the Local Storage folder is missing just about all the tags found under the Memory Buffer folder. When a remote gateway goes offline and comes back on, it would be great to know how many pending records are left to transmit as this affects the validity of sparkline graphs and anything else using the tag history. If there are backlogged items, then we can inform the user that the graph is not fully accurate.