Replot Spatial Plot as soon as 1. enter spatial plot tab _and_ 2. 'PlumLimEntry' changed

[andrejadd]

PlumLimEntry should be an reactive element and renderPlot the observer for it.

Or just invalidate the plot if enter into tab and change of PlumLimEntry detected.

[andrejadd]

solution: created an reactive function:

optionsSaved <- reactive({ 
    input$save_analyse_options 
  })

and call it inside the RenderPlot() function:

val <- optionsSaved()

Thus renderPlot() will be called if input$save_analyse_options changes and if the renderPlot observer is in the current context (shown in the panel).