- update to v4.9.0:
  * Support for specifying a fixed denominator for display of
    fractions (e.g. "0.3 ft ➞ 1/8 ≈ (3 + 5/8) in")
  * Return gcd of numerators divided by lcm of denominators in
    gcd() with non-integer rational numbers, and vice versa for
    lcm()
  * Add units for mean Gregorian and tropical years
  * Ignore underscore in number
  * Replace defunct exchange rates source and fix bitcoin
    exchange rate
  * Fix asin(x)=a, acos(x)=a, and atan(x)=a, when a contains an
    angle unit and default angle unit is set
  * Fix output of value converted to unit expression with
    numerical multiplier in denominator, e.g. "➞ L/(100 km)"
  * Fix segfault when trying to solve
    "(xsqrt(x)-ysqrt(y))/(sqrt(x)-sqrt(y))=x+sqrt(x*y)+y"
  * Fix parsing of case insensitive object name ending with
    Unicode character when followed by another Unicode character
    in expression, e.g. "микрометр"
  * Add history command, listing expression history
  * Display all exponents 0-9 using Unicode superscript
    characters if these are the only exponents in the expression

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