beanz 2.0

• Added a NEWS.md file to track changes to the package.

• Added unit test
• Made it consistent throughout the software and the manuscript that the half-normal prior is for ω rather than ω²
• Added initial step-size as an option of the sampler
• Added adapt-delta as an option in the software and set the default value to 0.95
• Added explicit report of Rhat in the results and warnings for problematic convergence based on Rhat summaries
• Removed in shiny the option HMC vs. Fixed-params
• The Stan models are optimized by vectorization and non-centered parameterization
• Updated the GUI to allow the user to enter numerical values directly for priors
• Added looic as the measure of goodness of fit and the basis for model comparison
• Renamed the parameters in lst.par.pri to match with the model instruction page
• Added line for generating results for no subgroup effect model in relevant example code

• Added model information to the output from function r.rpt.tbl