Utils: Remove unused and untested isLessThanUnsigned() and isLessThanOrEqualToUnsigned() helpers.
Utils: Remove unused and untested isLessThanUnsigned() and isLessThanOrEqualToUnsigned() helpers.

GroestlCoin/groestlcoinj,peterdettman/bitcoinj,schildbach/bitcoinj,peterdettman/bitcoinj,schildbach/bitcoinj,GroestlCoin/groestlcoinj,yenliangl/bitcoinj,GroestlCoin/groestlcoinj,yenliangl/bitcoinj,oscarguindzberg/bitcoinj,bitcoinj/bitcoinj,natzei/bitcoinj,bitcoinj/bitcoinj,natzei/bitcoinj,kmels/bitcoinj,oscarguindzberg/bitcoinj,kmels/bitcoinj