Implement FreeBSD's -n option to supress comments in the output.

Index: mtree.8
===================================================================
--- mtree.8	(revision 240747)
+++ mtree.8	(revision 240748)
@@ -202,6 +202,13 @@
 See
 .Xr init 8
 for information on security levels.
+.It Fl n
+Do not emit pathname comments when creating a specification.
+Normally  
+a comment is emitted before each directory and before the close of that
+directory when using the
+.Fl c
+option.
 .It Fl N Ar dbdir
 Use the user database text file
 .Pa master.passwd
Index: create.c
===================================================================
--- create.c	(revision 240747)
+++ create.c	(revision 240748)
@@ -112,9 +112,11 @@
 		    "<unknown>";
 	}
 
-	printf(
-	    "#\t   user: %s\n#\tmachine: %s\n#\t   tree: %s\n#\t   date: %s",
-	    user, host, fullpath, ctime(&clocktime));
+	if (!nflag)
+		printf(
+	    	    "#\t   user: %s\n#\tmachine: %s\n#\t   tree: %s\n"
+		    "#\t   date: %s",
+		    user, host, fullpath, ctime(&clocktime));
 
 	if ((t = fts_open(argv, ftsoptions, dcmp)) == NULL)
 		mtree_err("fts_open: %s", strerror(errno));
@@ -125,12 +127,13 @@
 		}
 		switch(p->fts_info) {
 		case FTS_D:
-			printf("\n# %s\n", p->fts_path);
+			if (!nflag)
+				printf("\n# %s\n", p->fts_path);
 			statd(t, p, &uid, &gid, &mode, &flags);
 			statf(p);
 			break;
 		case FTS_DP:
-			if (p->fts_level > 0)
+			if (!nflag && p->fts_level > 0)
 				printf("# %s\n..\n\n", p->fts_path);
 			break;
 		case FTS_DNR:
Index: extern.h
===================================================================
--- extern.h	(revision 240747)
+++ extern.h	(revision 240748)
@@ -69,7 +69,8 @@
 const char *rlink(const char *);
 int	 verify(void);
 
-extern int	dflag, eflag, iflag, lflag, mflag, rflag, sflag, tflag, uflag;
+extern int	dflag, eflag, iflag, lflag, mflag,
+		nflag, rflag, sflag, tflag, uflag;
 extern int	mtree_Mflag, mtree_Sflag, mtree_Wflag;
 extern size_t	mtree_lineno;
 extern u_int32_t crc_total;
Index: mtree.c
===================================================================
--- mtree.c	(revision 240747)
+++ mtree.c	(revision 240748)
@@ -60,7 +60,7 @@
 
 int	ftsoptions = FTS_PHYSICAL;
 int	cflag, Cflag, dflag, Dflag, eflag, iflag, lflag, mflag,
-    	rflag, sflag, tflag, uflag, Uflag;
+    	nflag, rflag, sflag, tflag, uflag, Uflag;
 char	fullpath[MAXPATHLEN];
 
 __dead2 static	void	usage(void);
@@ -77,7 +77,7 @@
 	init_excludes();
 
 	while ((ch = getopt(argc, argv,
-	    "cCdDeE:f:I:ik:K:lLmMN:p:PrR:s:StuUWxX:"))
+	    "cCdDeE:f:I:ik:K:lLmMnN:p:PrR:s:StuUWxX:"))
 	    != -1) {
 		switch((char)ch) {
 		case 'c':
@@ -132,6 +132,9 @@
 		case 'M':
 			mtree_Mflag = 1;
 			break;
+		case 'n':
+			nflag = 1;
+			break;
 		case 'N':
 			if (! setup_getid(optarg))
 				mtree_err(
@@ -225,7 +228,7 @@
 {
 
 	fprintf(stderr,
-	    "usage: %s [-CcDdeLlMPrSUuWx] [-i|-m] [-E tags] [-f spec]\n"
+	    "usage: %s [-CcDdeLlMnPrSUuWx] [-i|-m] [-E tags] [-f spec]\n"
 	    "\t\t[-I tags] [-K keywords] [-k keywords] [-N dbdir] [-p path]\n"
 	    "\t\t[-R keywords] [-s seed] [-X exclude-file]\n",
 	    getprogname());