Incorporate "v6.3.5 dev feat/testthat rework"#436

StuartWheater merged 4 commits into

v7.0-dev-feat/performancedatashield/dsBase:v7.0-dev-feat/performancefrom

v6.3.5-dev-feat/testthat-reworkdatashield/dsBase:v6.3.5-dev-feat/testthat-reworkCopy head branch name to clipboard