scmfmt - Use par instead of fmt and increase default width

The `-p` option is only available in OpenBSD. As there's no standard
way of ignoring lines by prefix, use `par`, which at least will be
installable almost everywhere.

scmfmt

@@ -21,9 +21,9 @@ i\
 
 bl' |
 sed  -e '1s/^/./' -e 's/^ /./' |
-fmt -p |
+par -P=. |
 awk '
-BEGIN { LIMIT = 65 }
+BEGIN { LIMIT = 72 }
 NR == 1 || /^[^\.]/ || length($0) < LIMIT {
 	sub(/^\./, NR == 1 ? "" : " ");
 	print;