Detect javascript errors

[spekary]

We should add something like the following to qcubed.js:

window.onerror = function(m,u,l){
jQuery.post("ajax/js_error_log.php",
{ msg: m,
url: u,
line: l,
window: window.location.href });
return true};

Something that would then post the error to PHP for logging and notification. Widgets that rely on javascript will silently fail on a javascript error. They then stop sending data to the server, and you get unexpected results, and it can be a while before realizing that the javascript has failed.

This apparently will not catch syntax errors, but will catch runtime errors.