Driving trains by braille

Several small changes based on simulation runs:

1. Setup vs game start rules clarified
2. As each initial share is auctioned that company builds a free link
3. Initial turn order after auction is now cash-based rather than starting with the L&MR player
4. Action rotation clarified
5. Actions are now explicitly stated as mandatory (unlike Wabash Cannonball)
6. Foreign Links may not be built until after the 3rd general dividend. (not sure this is needed)
7. Expand action requalified to limit builds to not more than three connections out from any city, and not all the connections from any city with more than two connections. This allows the dead ends (like Thurso and Penzance) to be interesting as well as the many two-connection way-stops
8. Clarified cases of merger shares auctioned without bids.