bug 4589: allow M::SA::Message to use IO::File objects to read in message (same as GLOB).  Also add in check to ignore unknown reference types.
bug 4589: allow M::SA::Message to use IO::File objects to read in message (same as GLOB).  Also add in check to ignore unknown reference types.

git-svn-id: e9fe9b84e32fc5e57b7d09c40cd78b14ea28ed71@289976 13f79535-47bb-0310-9956-ffa450edef68

apache/spamassassin,apache/spamassassin,apache/spamassassin,apache/spamassassin,apache/spamassassin