Add support for optiona "approved" option to be specify moderator's email addr

Apparently required by some news servers.
As requested via IRC:
<poindexter> Hi all, I've got a weird request. I'd like to post to a newsgroup that relies on automoderation. You need to add an approved: header to any posting to have it be accepted - keeps the non-techie riffraff away. is there a way to do that with newslink.js?

exec/newslink.js

@@ -161,6 +161,7 @@ var interface_ip_address=0;
 var port_set=false;
 var tls=false;
 var no_path=false;
+var approved;
 var area = {};
 
 if(this.server!=undefined)
@@ -256,6 +257,9 @@ while(!cfg_file.eof) {
 		case "max_newsgroups_per_article":
 			max_newsgroups_per_article=parseInt(str[1]);
 			break;
+		case "approved":
+			approved = str[1];
+			break;
 		default:
 			print("!UNRECOGNIZED configuration keyword: " + str[0]);
 			break;
@@ -555,6 +559,9 @@ for(sub in area) {
 			+ "]"
 			);
 
+		if(approved)
+			writeln("Approved: " + approved);
+
 		writeln("");
 		if(hdr.to.toLowerCase()!="all") {
 			writeln("  To: " + hdr.to);