standardized the spoof prevention:

- set the nonce and noncePrev for the handler when rendering the form
- include the current nonce in the hidden parameter "nonce"
- include an "action" parameter (so we know we want to execute something and hence, validate the nonce, rather than just display the page)
- if the nonce submitted doesnt match what is set in the nonce or noncePrev when validating, its invalid.  refuse to process