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-disk/content/diskmaps/ModemFirmware.json

@@ -0,0 +1,17 @@
+{
+  "ModemFirmware": {
+    "base": "file://Disk/Browser/Modem_Firmware/",
+    "location": "content/Modem_Firmware/",
+	"execute": "client:ModemReload",
+	"execute_when": "atEnd",
+	"service_owned": true,
+    "files": [
+      {
+        "file": "file://Disk/Browser/Modem_Firmware/Locale/en-US/modem_firmware.dat.gz"
+      },
+      {
+        "file": "file://Disk/Browser/Modem_Firmware/Locale/ja-JP/modem_firmware.dat.gz"
+      }
+   ]
+  }
+}