fix Credit_Invoice.php not selecting location to credit into correctly
Rewrite Exson's SendMailBySmtp() function
Exson: Fixed strpos error and make the smtp server name more generic when user not use a email address.
Ricard: SQL to upgrade to varchar account codes
Merge branch 'plugins' of github.com:fahadhatib/KwaMoja into plugins
Improvements to the database upgrade system for the new plugin architecture