[][reproducible] Bug description: Carl Sagan can has too many production

[bdubsky]

I found a fun bug on my first playthrough. Here is what happened, in order:

1. A city was building Launch Mars Habitation. In the linked file the city is Skedsmo.
   
2. I recruited a Great Scientist, Carl Sagan, with faith. Carl Sagan provides +3000 progress to any space race project. This is where the save file is located.
3. I activated Carl Sagan in the Spaceport. At this point the Mar habitation had maybe 1500 production left in the original game and 2110 production left where the save point begins.
4. After completing the production of the Mars habitation that turn, Skedsmo appears to have gained an absurd amount of free production. I was able to produce the following in a single turn each on replay:
   • Eiffel Tower (2100 production)
   • Operation Ivy (1000 production)
   • Build Thermonuclear Device (1000 production)
   • Zoo (405 production)
   • ... and in the original game I remember more, but this illustrates the point. Together that is 6615 production, when AT MOST there should have been 3390 (3000+ 78*5).

Keep in mind the city only has ~78 production per turn normally. It's unclear exactly what was going on (ie. how much extra produciton there was, how much it depleted per turn, etc), since unlike in earlier games I couldn't find a "2500/450 production" thing to illustrate how much extra the city maintained.

It is also important to note that this was NOT infinite production. After a few turns some of the buildings/wonders/projects began to take more turns. Not immediately, but slowly. For example, the Estadio do Maracana was originally 1 turn, then 2, then 13, etc. My first time through I remember the one-term-production lasting until the end of the game ~8 turns later, but when replaying it to demonstrate the bug it only lasted 4 turns. My guess is this is related to how much production was left on the original Launch Mars Habitation, as there was more left in the replay.