Convert LATIN-1 to ISO-8859-1 charset on export to NNTP

From: Carlos Navarro (2:341/234.1)

Messages that use CHRS: LATIN-1 are not displayed properly in newsreaders
(Synchronet's NNTP server renders them with the default charset=IBM437).

This fix may work: edit exec/load/newsutil.js, at line 77 insert

        case "LATIN-1 2":
                charset = "ISO-8859-1";
                break;

If you want to test: ßΘφ≤· ± (accented aeiou, n with tilde)

exec/load/newsutil.js

@@ -74,6 +74,9 @@ function write_news_header(hdr,writeln)
 				case "CP866 2":
 					charset = "KOI8-R";
 					break;
+				case "LATIN-1 2":
+					charset = "ISO-8859-1";
+					break;
 				default:
 					charset = "IBM437";
 					break;