Move/Remove the Great Prophet panel in GP view to the last slot

**Issue by [chaorace](https://github.com/chaorace)**
_Friday Nov 04, 2016 at 23:53 GMT_
_Originally opened as https://github.com/CQUI-Org/cqui/issues/40_

----

Barring the very early game, great prophets don't really bear any relevance to someone visiting the GP view. Because of this, it makes sense to move the great prophet panel to the last slot on the GP view... and to possibly even hide it entirely once all available great prophets have been created

Start by locating the GP view and the Great Prophet panel in the Lua UI code, then inspect how the view orders its panels. Confirm whether the intended result is only moving the panel or also hiding it after all available Great Prophets are created; done means the panel appears in the last slot and the agreed visibility behavior works in the relevant game states.

Written by the indexing model from the issue text.