C RM ANOVA: use mean for plot instead of normalised mean
C RM ANOVA: use mean for plot instead of normalised mean

I used the normalised means (calculated so that means of each
between-subject group are the same) instead of the regular means. It
makes more sense to use the regular means in descriptives plots though.

fixes #853

dropmann/jasp-desktop,FransMeerhoff/jasp-desktop,aknight1-uva/jasp-desktop,FransMeerhoff/jasp-desktop,fdabl/jasp-desktop,TimKDJ/jasp-desktop,vankesteren/jasp-desktop,vankesteren/jasp-desktop,tlevine/jasp-desktop,aknight1-uva/jasp-desktop,FransMeerhoff/jasp-desktop,AlexanderLyNL/jasp-desktop,raviselker/jasp-desktop,AlexanderLyNL/jasp-desktop,boutinb/jasp-desktop,jasp-stats/jasp-desktop,aknight1-uva/jasp-desktop,dostodabsi/jasp-desktop,jasp-stats/jasp-desktop,raviselker/jasp-desktop,FransMeerhoff/jasp-desktop,cgvarela/jasp-desktop,Tahiraj/jasp-desktop,jasp-stats/jasp-desktop,AlexanderLyNL/jasp-desktop,jasp-stats/jasp-desktop,fdabl/jasp-desktop,fdabl/jasp-desktop,dostodabsi/jasp-desktop,TimKDJ/jasp-desktop,boutinb/jasp-desktop,boutinb/jasp-desktop,raviselker/jasp-desktop,raviselker/jasp-desktop,jasp-stats/jasp-desktop,dropmann/jasp-desktop,AlexanderLyNL/jasp-desktop,aknight1-uva/jasp-desktop,AlexanderLyNL/jasp-desktop,dostodabsi/jasp-desktop,vankesteren/jasp-desktop,boutinb/jasp-desktop,TimKDJ/jasp-desktop,vankesteren/jasp-desktop,fdabl/jasp-desktop,dostodabsi/jasp-desktop,vankesteren/jasp-desktop,Tahiraj/jasp-desktop,TimKDJ/jasp-desktop,aknight1-uva/jasp-desktop,aknight1-uva/jasp-desktop,jasp-stats/jasp-desktop,TimKDJ/jasp-desktop,FransMeerhoff/jasp-desktop,dostodabsi/jasp-desktop,vankesteren/jasp-desktop,cgvarela/jasp-desktop,AlexanderLyNL/jasp-desktop,raviselker/jasp-desktop,vankesteren/jasp-desktop,dropmann/jasp-desktop,dostodabsi/jasp-desktop,jasp-stats/jasp-desktop,dropmann/jasp-desktop,dropmann/jasp-desktop,dostodabsi/jasp-desktop,cgvarela/jasp-desktop,Tahiraj/jasp-desktop,tlevine/jasp-desktop,Tahiraj/jasp-desktop,TimKDJ/jasp-desktop,FransMeerhoff/jasp-desktop,tlevine/jasp-desktop,TimKDJ/jasp-desktop,FransMeerhoff/jasp-desktop,fdabl/jasp-desktop,fdabl/jasp-desktop,AlexanderLyNL/jasp-desktop,jasp-stats/jasp-desktop,boutinb/jasp-desktop,raviselker/jasp-desktop,dropmann/jasp-desktop,tlevine/jasp-desktop,cgvarela/jasp-desktop,dropmann/jasp-desktop,raviselker/jasp-desktop,boutinb/jasp-desktop,tlevine/jasp-desktop,TimKDJ/jasp-desktop,AlexanderLyNL/jasp-desktop,aknight1-uva/jasp-desktop,Tahiraj/jasp-desktop,cgvarela/jasp-desktop,fdabl/jasp-desktop,vankesteren/jasp-desktop,boutinb/jasp-desktop,boutinb/jasp-desktop,FransMeerhoff/jasp-desktop