Diagnose lines that are implicitly treated as REM lines.

Diagnose REM commands that are implicitly treated as having MSG type.

Properly start all lines that should start with REM, with REM.

src/dorem.c

@@ -540,6 +540,7 @@ int ParseRem(ParsePtr s, Trigger *trig, TimeTrig *tim)
 	    DBufFree(&buf);
 	    trig->typ = MSG_TYPE;
 	    if (s->isnested) return E_CANT_NEST_RTYPE;
+            Wprint("Missing REM type; assuming MSG");
             parsing = 0;
             break;
 	}