Update list for DesktopCalc

DesktopCalc 2.1.21 changelog from June 12, 2017

Enhanced performance and internal optimization

DesktopCalc 2.1.20 changelog from April 8, 2017

Overhaul of the underlying algorithms

DesktopCalc 2.1.19 changelog from February 12, 2017

Higher accuracy and larger extents

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