Made links to phpmyadmin and webmail in the database and mailbox lists configurable.

install/tpl/system.ini.master

interface/lib/classes/listform_actions.inc.php

interface/web/admin/form/system_config.tform.php

interface/web/admin/lib/lang/en_system_config.lng

interface/web/admin/system_config_edit.php

interface/web/admin/templates/system_config_mail_edit.htm

interface/web/admin/templates/system_config_sites_edit.htm

interface/web/mail/mail_user_list.php

interface/web/mail/templates/mail_user_list.htm

interface/web/sites/database_list.php

interface/web/sites/templates/database_list.htm

interface/web/sites/web_domain_list.php