FACTBOX-Banks' bill for FX rigging tops $10 bln after latest fines

May 20 (Reuters) - Six big banks agreed to pay $5.7 billion to U.S. and UK authorities on Wednesday over allegations they rigged currency markets, taking the industry's bill for the scandal to more than $10 billion. JPMorgan, Citigroup, UBS, Barclays and RBS agreed settlements with the U.S. Department of Justice. Barclays was also slapped with fines from other UK and U.S. authorities. The U.S. Federal Reserve fined all five banks and also Bank of America. In November, six banks were fined $4....