VisualizeSimon2Stage 0.2.1

Vignette added # VisualizeSimon2Stage 0.1.5 Release for R 4.4.0 # VisualizeSimon2Stage 0.1.4 Bug fix # VisualizeSimon2Stage 0.1.3 Accommodate package ggplot2 ver 3.5.0 # VisualizeSimon2Stage 0.1.2 Remove unicode from plots # VisualizeSimon2Stage 0.1.1 Bug fix to allow r1=0 and r=0, thanks to karl.ove.hufthammer at helse-bergen dot no # VisualizeSimon2Stage 0.1.0 First release.