* updated shared.cgi to read T20 firmware ver
* improvements and fixes
1. now composes urls for RTSP
2. css improvements
3. added diagnostics (got to test first hand with a corrupt file system SD card!)
4. fixed reboot not rebooting ...
5. remove debug code from jpeg.cgi
fixed display of camera version, fixed issue jpeg.cgi, added diagnostics page, minor css improvements, made shared.cgi for common code between diagnostics and config