Improved dark theme

Improved image of data structure

Improved labeling for small multiples

Several improvements

-New option for adding (colored) labels to the data
-Updated the about.html
-slight change of the order of Tol_muted palette
-Okabe&Ito palette is now default
-Several small changes to text in GUI
-Added option to download tidy data

Added/improved several features

-info on data structures (wide vs tidy)
-improved retrieval of max and min times for trimming sliders
-automatic display of plot when example data is used in the ?data variable
-improved retrieval and setting of parameters through URL
-improved annotation of heatmap with text
-object labels in heatmap are hidden by default

Added/improved several features

-info on data structures (wide vs tidy)
-improved retrieval of max and min times for trimming sliders
-automatic display of plot when example data is used in the ?data variable
-improved retrieval and setting of parameters through URL
-improved annotation of heatmap with text
-object labels in heatmap are hidden by default