place mutex for the contracts vector
Cleanups
BID price must be equal or higher than ASK price. If not, the
counterparty must have patched the client to cheat.
my orders should be BTC centric, otherwise errors can happen because
seller pays higher price. This should not happen, but one never knows.
Remove irritating info msg box at startup
Roll back seller side
added funds allocation
prevent user from leaving fields empty
reserved / acclocated funds for contracts and fees