Added income discount rate, and accIncomeDiscounted.

Used for evaluating tests.

Also changed .gitignore a bit.
Number adjustments.

- Adjusted the average income a bit
- a few comments moved
- changed some prices
Added Monopoly-Blue experiment.

It turned out to be pointless, but a good exercice.
The underlying problem needs to be resolved though - what motivates the
first network carrier to not put infinite prices?
The answer is obviously land-lines, but, how to implement them?!
Tried different method for computing discounted accIncome.

But it is commented out, because it didn't prove helpful so far.

Also added seed settings to all the BS tests.
Added BS experiments, tinkered with BS variable setup.

Now you can put -1 as a price in a BS experiment for prices of Red or
Blue's reaction price, and it will copy the first price of Blue.
Added BSExp Cartel, not useful.
Added new Nash BSExp., deleted a bunch of old ones.
Experimental setup for change of price experiments.