Prevent HTTP 414 Request-URI Too Large responses

The server refuses batch requests with large data sets: *listBatchSubscribe*, *listBatchUnsubscribe*, and *listSubscribe* are improperly converted POST requests to GET requests with long query strings. To prevent this, the **type** attribute of any cfhttpparam inside a loop was set to **formfield**.

E.g.: The server responds with **HTTP 414: Request-URI Too Large** when calling *listBatchSubscribe* for 700 records.