Added 1.5 to about.xml

I have no idea if the original issue this mod fixes is still present (factions showing up without player's intending). It seems not in initial tests, but...

It can still reveal factions that were previously invisible, allowing you to customize them.

It seems at a first glance to not spawn a single faction by default anymore, but none can be added (if the faction isn't made right) without this mod?

Hard to tell since a few modders 'mysteriously' fixed their FactionDefs.

Initial upload.