BcLib update

Updates list:

> Swap2Interest_Volume function now supports swap type 1 also;

> "Swap Functions" block renamed to "Financial Math";

> "Financial Math" block expanded to include functions for calculation or discount of currency futures;

> GetCurrency() now works when market is closed too;

> Added optimization types OPTIMIZE_SWAP_ONLY_VIRTUAL , OPTIMIZE_PRICE_ONLY_VIRTUAL to BcArb as possible parameter values for GetBestCross();

> Added variable bool SupportOneAtomCrosslists = false that can work as a switch to influence CreateCrosslist() and CreateCrosslistsTable() to discard or not one-atom crosslists;

...and perhaps others which I don't remember.

Check also the new and repaired SwapFinder_script that uses everywhere UnitsToLots().