Made $session->private_key protected and added pk_{en,de}crypt methods for encrypting and decrypting data using the private key
/*
* Auto-completing page/username fields
* NOTE: A more efficient version of the username field is used for Mozilla browsers. The updated code is in autofill.js.
*/
//
// **** 1.1.4: DEPRECATED ****
// Replaced with Spry-based mechanism.
//