Checkin: scan folder names

I finally checked this one in in head and rc1.1. It makes the code 
follow the man page.

/Anders


--- nmh-1.0.4/uip/scan.c        Fri Feb  4 21:28:24 2000
+++ nmh-1.0.4/uip/scan.c.new    Tue Jan 15 07:57:48 2002
@@ -316,7 +316,7 @@
 
            switch (state = scan (in, msgnum, 0, nfs, width,
                        msgnum == mp->curmsg, unseen,
-                       hdrflag ? folder : NULL, 0L, 1)) {
+                       folder, 0L, 1)) {
                case SCNMSG: 
                case SCNENC: 
                case SCNERR: