Overview of changes in gcalctool 5.91.3

    * Fix incorrect calculation of tanh
    * Fix dropping of decimal points when thousand separator is '.' (Bug #635517)
    * Improve conversion bar
    * Fix crash in scientific mode
    * Add new automatic display mode that switches from fixed to scientific when
      numbers are too large

Overview of changes in gcalctool 5.91.2

    * Fix broken thousands separators code (Bug #628908)
    * Don't make window resizable, it is not supposed to be
    * Use icons for undo and clear buttons as the translations cause them to be
      oversized in some languages
    * Handle Han digits (〇〡〢〣〤〥〦〧〨〩)
    * If a thousands separator is not defined then use ' ' (Bug #632182)
    * Fix incorrect error text for acosh function (Bug #632614)