(PR#10110) AI underestimates Temples

<URL: http://rt.freeciv.org/Ticket/Display.html?id=10110 >

This evaluation seems to work correctly:
	  case EFT_MAKE_CONTENT:
	    if (!government_has_flag(gov, G_NO_UNHAPPY_CITIZENS)) {
              int a = MIN(pcity->ppl_unhappy[4] +
pcity->specialists[SP_ELVIS], amount);
	      v += a * a * 2;
	      v += amount * c;
	    }
Another problem is that AI doesn't reassign workers when it finish
building an improvement (This is a serious bug).
--
mateusz