lots more stuff

- proper gzip download for disk system (aka WNI reinventing the Content-Encoding: gzip wheel)
- send Last-Modified for static files
- send wtv-checksum for all disk system downloads
- other fixes

zefie_wtvp_minisrv/ServiceVault/wtv-1800/noflash.js

@@ -1,5 +1,5 @@
 if (socket.ssid != null && !ssid_sessions[socket.ssid].get("wtvsec_login")) {
-	var wtvsec_login = new WTVSec();
+	var wtvsec_login = new WTVSec(minisrv_config);
 	wtvsec_login.IssueChallenge();
 	wtvsec_login.set_incarnation(request_headers["wtv-incarnation"]);
 	ssid_sessions[socket.ssid].set("wtvsec_login", wtvsec_login);