Updates to sync to upstream, license changes and some utilities#15

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benjaminleighton wants to merge 18 commits intoCSIRO-enviro-informatics:masterfrom GeoscienceAustralia:master

+475-837

Commits on Jul 28, 2020

Commits on Aug 19, 2020

Commits on Aug 20, 2020

upgraded with optional multi core processing
bellie888
authored

Commits on Oct 15, 2020

Merge pull request #17 from CSIRO-enviro-informatics/feature/performance_improve_ray_trace
bellie888
authored

Commits on Jun 13, 2021

Commits on Jun 14, 2021

Merge pull request #18 from nicholascar/repo-citation
bellie888
authored

Commits on Feb 23, 2022