* Update record as soon as possible. If update/insert record fails email to admin...

 * Update record as soon as possible. If update/insert record fails email to admin to have update manually.
 * ignore_user_abort(true) at critical section (before fwrite($fp, "POST /gateway/transact.dll).
   This is last change to ignore request for user.
 * Made some functions "static" to call function directly. So, no need new enrolment_plugin_authorize() instance.
   Now, these are static:
   get_list_of_creditcards, zero_cost, get_course_cost, prevent_double_paid, email_to_admin, check_openssl_loaded
 * Some mtrace cleanup. Removed default new line.

This is big work. When PHP5 is required for moodle in the future, I will add static modifier to functions.
Now and future, this plugin is/will unbreakable; Merged from MOODLE_16_STABLE. :)