Improvements to Duplicate Submit checks

Administrative console interface is projected the way, that user not required to perform dbl-click to do anything. But there are some old-school users, that still use dbl-click on toolbar buttons.

For those users we've implemented protection, that one button/form could not be submitted more then one time in 500ms. But still one in a year some users were able to perform dbl-click where 2nd click was 500ms after 1st click. This resulted in double form submit. Usually double submit is not a big problem, but in some case data could be lost (based on what actually happens after given form is submitted).

I propose a change, where after form submit is made all following form submit attempts should be ignored. Submitted is automatically reset (in parent window) after new window is opened. Programmer still should manually reset submitted mark ("submitted = false;") in places where form should be submitted multiple times without performing full refresh of page itself (e.g. javascript form validation and so on).