Orange Panel

• New function "plot_response" which use the ggplot2 and plotly packages to plot the curve or surface of the expected response (contribution) against some variable and the transition variable.
• The estimation function "EstPSTR" will return the estimated time-invariante individule effects.
• The width of the separating lines in printing the results can adjust itself automatically to fit the width of the console.
• Rewrite the "version" function.