-Add: link graph job implementation
-Add: link graph schedule and typedefs for LinkGraph and related classes
-Add: demand handler for link graph
-Add: Multi-Commodity-Flow solver for link graph
-Add: flow mapper for link graph
-Codechange: save and load link graphs, jobs and the schedule
-Add: explanation of the link graph's inner workings
-Codechange: track capacities and usage of links
-Codechange: save and load flow stats
-Add: multimap implementation with guaranteed order between equal keys
-Feature: distribute cargo according to plan given by linkgraph
-Codechange: occasionally delete stale links and reroute cargo
-Add: legend for linkgraph overlay
-Add: linkgraph overlay over main viewport
-Feature: consider cargo waiting at other stations for rating at the origin station
-Add: function for deterministic approximate division
-Feature: show cargo by next hops and final destinations in the station GUI
-Codechange: remove STR_STATION_VIEW_CARGO_RATINGS_TITLE
-Add: help texts for settings
-Add: german translation