dexterMST: dexter for Multi-Stage Tests

Authored by:Timo Bechger, Jesse Koops, Robert Zwitser, Ivailo Partchev, Gunter Maris indexterMST 0.9.6.
Source:multistage_fundamentals.Rmd, Vignette:multistage_fundamentals.html. Last updated:2023-11-29.