Staff changes and added

I have changed the name of coach into production manager. Sounds better.

The next thing I am planning to do is adding a few extra staff members today.

To be added today:
- Distribution manager: Lowers tax price on selling and buying goods
- Financial director: Lowers the fix costs per unit
- Human resources: Lowers the variable costs per unit

I also changed the price of the logistic manager to ?8 per warehouse per day.