Detection of current major browsers

Since I have no way to add code myself, I make the request and provide the patch at the same time.
<http://www.qcodo.com/downloads/item.php/218>
<http://zcodo.com/content/support-current-browsers>

This patch is based in Zcodo 0.4.43.1 and allows Qcodo to correctly detect the next browsers (I've included all the major browsers since the MSIE 6 epoch):

- MS Internet Explorer: 6, 7 and 8.
- Firefox: 1, 1.5, 2 and 3.
- Safari: 2, 3 and 4.
- Opera: 7, 8 and 9.
- Konqueror: 3 and 4.
- Chrome: 0 beta and the future 1 stable.

It also detects the client operative system (but not its version):
- Windows
- Linux
- Macintosh

I've only patched Qcodo to detect previously undetected browsers (as flagging them as “Unsupported” is totally unuseful), but of course this doesn't mean that I've patched the entire Qcodo framework to support them. Qcodo unsupported browsers keep unsupported, but now they're correctly detected so we can add support to them.

I agree with the approach based on browser features better than in browser detection. But I've stumbled upon cases where these code decisions must be done in the server side (when rendering controls based on very nested layers, when rendering runtime styles to position elements, and specially when including incompatible Javascript modules or Javascript behaviours based on bubbling or capturing DOM2 events). In these cases you can't rely on broser features, but just on the browser agent string (not ideal, but it's the only way).

So I've found necessary to sometimes base the rendering flow in the detected browser. In fact that's the reason because I decided to include support for the detection of all major browsers.

Also, from a feature perspective it's useful. And it doesn't hurt.

Buenos d