Fixes #943 - Least Common Multiple error for certain numbers.#957

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gkwaerp wants to merge 3 commits intokodecocodes:masterfrom

gkwaerp:lcm-fatalerror

Commits on Oct 21, 2020

Added failing test.
Geir-Kåre S. Wærp
committed
Fixed incorrect check for non-negative numbers.
Geir-Kåre S. Wærp
committed
Updated documentation.
Geir-Kåre S. Wærp
committed