Digits to work with most encodings

Enhancements

• Introduce MarshalBinary, MarshalText, UnmarshalBinary, UnmarshalText on Digits so that Digits will work with most encodings.
• Introduce GetDigits function which can be used to fetch certain digits from either a Mantissa or a Digits instance.

Breaking Changes

• DigitsBuilder gone.
• Mantissa.Digits function gone in favor of GetDigits.

Digits Instances Printable and Searchable

Enhancements

• Digits instance has PrintXXX methods
• FindXXX functions that work on both Mantissa and Digits instances
• Introduce IteratorAt, Reverse, ReverseAt, Min, Max, and Len on Digits
• Introduce DigitsBuilder
• FindXXX functions no longer copy pattern, but Find still does as it returns an iterator.

Breaking Changes

• Removed FindXXX methods off of Mantissa. These are standalone functions.
• DigitsAt and Send methods on Mantissa gone
• DigitsAtP method on Mantissa renamed to Digits.
• DigitAt method on Mantissa renamed to At.
• NewPositions function gone. Zero value of Positions ready to use.

Introduce DigitsAtP with Digits and Positions types

Enhancements

• Introduce DigitsAtP on Mantissa.
• Introduce Digits and Positions types

Introduce DigitAt, DigitsAt, FindAllSlice

Enhancements

• Introduce DigitAt, DigitsAt, and FindAllSlice on Mantissa.

Refactoring

• printers.go became consumers.go

Introduce WithSignificant

Enhancements

• Introduce WithSignificant method on Number and Mantissa.

Documentation Updates

• On Find method, note that pattern is a sequence of digits from 0 to 9.

Refactoring

• Break sqroot.go into multiple files

Introduce Iterators and new Sqrt variants

Enhancements

• On Mantissa introduce Iterator() which is iterator version of Send(), and Find() which is the iterator version of FindAll().
• Introduce Sqrt(), SqrtRat(), SqrtBigInt(), SqrtBigRat().

Documentation Updates

• Add example code for Mantissa.Find, Mantissa.FindFirstN, and Mantissa.FindAll.

Breaking Changes

• SquareRoot() function gone
• Sqrt() now takes a single int64

Introduce FindFirst, FindFirstN, and FindAll

Enhancements

• Introduce FindFirst, FindFirstN, and FindAll methods on Mantissa.

Remove Memory Allocation from SquareRoot Function

Enhancements

• Remove memory allocation from SquareRoot function

Introduce Sqrt function

Enhancements

• Introduce Sqrt function which takes the square root of any rational number.

Fix Mantissa Print methods

Bug Fixes

• Mantissa.Print methods to print "0" when maxDigits <= 0.