mysql server variable name change

table_cache became table_open_cache as of mysql 5.5
Email Search updates

jquery form validation is enabled.
ajax parameters are passed through jquery getJSON data handling
Annotated script.js as deprecated.
Email List Updates

Updates the Email List functionality to the modern VuFind+ 2014 methods
and structures.
Javascript functions moved under lists.js, PHP actions done in
MyAccount\AJAX.php