Release 1.7.0

New in release 1.7.0:

1. In addition to the method

   public func expMod(_ x: BInt, _ m: BInt) -> BInt

there is a new method

public func expMod(_ x: BInt, _ m: Int) -> Int

where the modulus is an 'Int' instead of a 'BInt'

a.expMod(x, 17) is much faster than a.expMod(x, BInt(17))

2. In addition to the method

   public func sqrtMod(_ p: BInt) -> BInt?

there is a new method

public func sqrtMod(_ p: Int) -> Int?

where the prime number is an 'Int' instead of a 'BInt'

a.sqrtMod(17) is much faster than a.sqrtMod(BInt(17))