added DummyProgressBar and improved progressbar handling in `metapop.run`
file from the old project; weights can be used as templates for new weights
colors now via `colorbrewer`; improved legend
removed obsolete code fragments
removed some more fragments
removed old scenario files
new `get_closest_generation` method; started `plot_overview` method
formerly scenario_3; we are close to start simulating, this shall be the first scenario
keep these scenarios for now