helpers.go defines several helper functions for the create of new decimal's from int's that make code using decimal a bit easier to read. Further more it implements a.Max() and a.Min() functions in the same fashion as other arithmetic functions like Add & Sub. (the decimal package already implements Max(d, d2....) and Min(), but these two helper functions are complementary to them.
Finally a.Float() is a convenience function for a.Float64() that ignore the precise bool, allowing inline use of the float conversion function
