* Verifying a username exists should use already present valid_user function
* Create new functions in acctfuncs.inc.php with SQL queries from addvote.php
* Centralization of DB code important in a future transition to PDO interface

Signed-off-by: canyonknight <canyonknight@gmail.com>
Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>