Added spamfilter policys

interface/web/mail/form/spamfilter_policy.tform.php

interface/web/mail/lib/lang/en_spamfilter_policy.lng

interface/web/mail/lib/lang/en_spamfilter_policy_list.lng

interface/web/mail/list/spamfilter_policy.list.php

interface/web/mail/spamfilter_policy_del.php

interface/web/mail/spamfilter_policy_edit.php

interface/web/mail/spamfilter_policy_list.php

interface/web/mail/spamfilter_whitelist_del.php

interface/web/mail/spamfilter_whitelist_edit.php

interface/web/mail/templates/spamfilter_other_edit.htm

interface/web/mail/templates/spamfilter_policy_edit.htm

interface/web/mail/templates/spamfilter_policy_list.htm

interface/web/mail/templates/spamfilter_quarantine_edit.htm

interface/web/mail/templates/spamfilter_taglevel_edit.htm