* add ability to restrict www access / css changes
-can now use WEB_SERVER_OPTIONS to decide what parts of the web system are accessible. Set it to `WEB_SERVER_OPTIONS="cam config car jpeg"` to access everything. Remove things you don't want accessible.
-make the top part of the pages cleaner - now the image in config/cam defaults to smaller but is clickable to see it bigger.
- separate feed.js from config.js and cam.js
-add warning about RTSP fimrware to diagnostics
* add info on WEB_SERVER_OPTIONS
* Update multicam.html
track and display refresh speed.
* 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
* updates to config.cgi and jpeg.cgi
* Update config.cgi
* config.cgi: type checks, blank line keep, css
* renamed to config.css (other css not used)
* fix bad link
