Re: A few questions
Population does effect production on a planet. If you click on the abilities button for your homeworld, you'll see a bunch of population-related bonues, including some to production.
I also suspect population directly effects facility production. The ship building rate is determined by the space yard's rate (so population is less of a factor). Facil construction might depend on population - I'm not that sure about this, though.
I don't know about the supply requirement for travel, either, but would really like to know it.
No idea about the quadrant preferences.
What creates happiness depends on your race settings. You can choose peaceful, neutral, or warlike (not sure if that's the actual name). Peaceful likes peace and when you make treaties. Warlike prefers combat and doesn't like you making treaties. Neutral doesn't like any involvement with the outside.
I don't know much about the happy race thing.
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