first contribution to widgets

[hyunjimoon]

Jason has coded customization function for the following which I find useful for hierarchical bayesian in general.

• random index selection
• create list of global variable from .mdl file
• replace zero in .cin file to 10^-6
• check payoff improvement and end optimization when the improvement is below constant threshold
• plot of payoff function

Angie and Batman have/will code

• sensitivity calculation
• plot of payoff function

and if @tseyanglim could help (e.g. teach us or giving clear instructions) the three of us keep our codes in one place (e.g. widgets) we could reuse them.