roundabouts

v0.2.13: roundabouts

Major changes:

• New save_dodgr_streetnet and load_dodgr_streetnet functions; thanks to idea from @FlxPo
• Edge maps used to uncontract graphs now store edges in original order, enabling complex edge sequences such as polygons to be reconstructed (#173).
• Add "Imports: fs" to ensure cache paths work on all (ie windows) machines (#163)
• Implement directional travel in roundabouts on weight_streetnet.sc, thanks to @deanmarchiori (#175).

Minor changes:

• Add example code for dodgr_dists_categorical
• Slightly extend categorical routing vignette
• fix caching bug in dodgr_centrality (#138), thanks to @mem48
• Fix bug with bbox in dodgr_streetnet, thanks to @LeshunXu (#174)
• Fix bug in src/graph-contract.cpp that led to CRAN warning (| -> ||)