ZPE 1.8.6 update

ZPE version 1.8.6 (Younis) is a big update. 

One of the biggest changes to it is the deprecation of the built-in web server. This has been deprecated in favour of a much more streamlined way of working.

The reason for this. Well, there are a few reasons. The first is that it contradicts the Velocity Web Server (VWS) that I'm building. The ZPE web server was always slow compared with my new VWS which is designed to be compatible with a variety of languages and environments. VWS works with ZPE through what's called a Velocity Module hook now anyway. 

For now the server remains in place but in the next few weeks I plan to remove it altogether and perhaps reimplement it using the basis of VWS.