usability enhancements

[jonasklingebiel1]

I came up with a few usability enhancements, some of them should be quite easy to implement:

• Is there an option to store the data of objective_plot and tuner_parameter_plot as CSV? This would be quite helpful. I know that the data is stored in the log-file but writing a parsing script that extracts the relevant data is time-consuming and leaves room for error.
• The automatically updating plots during optimization are very helpful. All three plots are generated on the same window position, so the plots overlap and need to be moved manually. Plotting into one figure using subplots or specifying different plot positions would be helpful
• After a successful run, writing the directory where the results are stored into the log would be helpful. Further, it would be convenient if an explorer window linking to the result directory is opened automatically.