echotest page start button needs autocomplete off for button to be re-enabled on reload in firefox

strange but true
http://stackoverflow.com/questions/5985839/bug-with-firefox-disabled-attribute-of-input-not-resetting-when-refreshing
Merge pull request #119 from ploxiln/echotest_button_ff

echotest: fix Start button being disabled after stopping
Fixed demo pages as per #119
Further fixes on inputs in demo pages as per #119