new proxy detection code added

We have added detection of Bluecoat's Secure Proxy Appliance to our proxy test tool. So, if you're behind one of those, you will be told about it; however, as it does not reveal your true IP address, it can be considered almost anonymous.

Almost, since it does provide some kind of hash value, which, I presume, can be used to derive true IP address from proxy logs or other records.

Thanks to Mr. M.B. who pointed our attention to the detection of this proxy and provided test results.