XVI spread is technically working (probably), but has not been tested or balanced, so let's disable it for 2.5. After we've branched, we need to do the following:

> commenting out "event "cp_start_xvi_spreading""
> and it's not part of 2.5
> but let's do that once we branched
> oh, testing is quite easy

> also it looks like at interest level 200 the tech is researched and xvi is going to spread
<source lang="ufo">events main
{
rs_alien_xvi_event 200
rs_enemy_on_earth_event 450
}</source>

> we also need to check a couple research texts and make sure that XVI button doesn't appear.