[PvK]

Ok, how does this adjustment to Happiness look to everyone?

Happiness:
==========
* Basic cost lowered from 25 to 1.
* Threshold unchanged at 20.
* Positive Threshold cost lowered from 100 to 2.
* Negative Threshold cost lowered from 10 to 1.

Thanks to Alneyan for bringing my attention to the practical irrelevance
of this attribute. His test results show that it does extremely little
to the happiness level of planets, even at extreme values, and even when
not using anything (like troops or UPC's) to boost happiness. Therefore
I reduced the basic and negative threshold value to 1, and the positive
threshold value to 2. Minimum setting of -50 gives 50 points. Maximum
setting of +50 costs 80 points.