Update vboxadm-current.sql to allow bigger quota for mailboxes and more then 255 chars in the local part of aliases

Table aliases:
changed goto: from varchar(255) to varchar(1020) to allow more recipients in an alias
Table mailboxes:
changed quota: from int(16) to bigint(16) for bigger mailboxes then 4,2gb. An user can set values like 10gb or 15gb for mailboxes now.