BUGFIX: When user returned back to main menu, then loaded back the game, internal state wasn't recognizing.
REBALANCE: When there was no listing present, putting a product to sale would cause it to have zero value, because technically it is the whole market. Now lowest limit is 25% of it's base value.
REBALANCE: Increased user selling chance by 10%.
REBALANCE: When publishing a listing, the value could only be increased/decreased by F$0.1, making it nearly impossible to set your own price. Now you can increase/decrease by 5% of base price.
REBALANCE: Now the listing menu will not be occupied by other companies trying to sell, but not to purchase.