Show deprecated region seeds (or tile seeds) when option in debug dialog is active
IsoMap is able to show so called deprecated region/tile seeds. Seeds are considered to be deprecated if the have been used for isochrone computation, but the result of the isochrone is cached and an incremental calculation based on the cached "intermediate" result was performed.
By now there is a boolean flag in the isochrone.js file that handles the behavior of deprecated seeds (if they are shown or not). We should include a checkbox in the debug dialog to handle the behavior.