Alliances break & forbid all treaties with other races

Description

As it stands, Alliances are next to useless in v1.35. Each member of a newly formed Alliance finds that their treaties with all other empires have been cancelled, and they cannot be re-established since this is "forbidden" by the terms of the Alliance, whether or not this is an actual term of the Alliance. This suggests that the Alliance is supposed to now function as a single political entity, instead of independent empires/states. However this is not the case either, as it also appears to be impossible to initiate a treaty between the Alliance itself and any other non-Alliance empires.

I've marked this bug as "Normal", since the game doesn't crash or reformat my hard drive because of this, however... diplomacy can be a huge part of the game (particularly in multiplayer with other humans). The ability to form multi-empire alliances was one of the most exciting features of SE:V over SE:IV from my point of view. It's a hard pill to swallow that it still doesn't work properly.