Fix uninitialised varibales

Set $usertype and $domainname to safe non-null values to prevent
spurious errors being logged
refactoring quarantine_list
Adding dbconn and dbclose in postfix_relay.php

closes issue #76
Merge pull request #74 from philrandal/master

Initialize $usertype and $domainname in checklogin.php
Using logical AND where appropriate
Replacing rainingfrog.co.uk with securelist.com, maintained by Kaspersky

fix #37
Added the ability to show/hide the software version page

fix #73
remove undefined $_GET['action'] error on user manager
adding mysql_real_escape_string to select query on user manager
Better greys in table rows
fixing more undefined index error, as per issue #21
Domain user can't delete entries on whitelist and blacklist

Fix issue #55
Fix virus_info definition in example conf.php
Merge pull request #77 from philrandal/master

Fix virus_info definition in example conf.php
Merge branch 'master' of https://github.com/mailwatch/1.2.0