Happiness...driving me to dispair

[Q]

Some more tests:
1.) I finally did see an effect with a value of 100 for the "natural decrease": An unhappy colony got angry and a happy one got jubiliant (all other values in the happiness file were 0!).
2) The "decrease to other races" does what Geoschmo has told us: a positive value (as in the unmodded happines file) makes foreign races in your empire angrier. However the value of 20 seems quite low and has little effect at least in the games I have played. A value of 100 gives drastic results and a value of -100 makes the foreign races jubiliant when your native race is at the edge of a riot!