v0.4.3

Changes

• Use exponential formatting (scientific-notation) if number of leading zeros is greater than 5
  • so 1234e-304 is formatted as 1.234e-301 rather than 0.00.....(300-zeros)....00123
  • Fixes "out of memory errors" when massive amounts of zeros would have been printed
• Add methods for printing using scientific-notation & engineering-notation
• Add derived Clone trait to ParseBigDecimalError
• Preserve scale when adding zero
  • Mimics Python's Decimal behavior:

    >>> Decimal("1.2") + Decimal("0.00000")
    Decimal('1.20000')

• Minor optimizations removing unnecessary clones in addition and multiplication