igraph for R: R interface of the igraph library for graph theory and network analysis

See https://github.com/igraph/rigraph/blob/f3fa58b/src/vendor/cigraph/CHANGELOG.md for a complete changelog of the bundled C core, and https://github.com/igraph/rigraph/compare/1bd2bf79..f3fa58b#diff-aeb78e0159780a9b26daabaf6f95f450b0cfec7161fc735f27ad69145a57dc84 for the changes since the igraph 2.0.1. (A permanent link to the most recent changelog of the C core used in the R package is https://github.com/igraph/rigraph/blob/main/src/vendor/cigraph/CHANGELOG.md.)

Bug fixes

• g + vertices(1, 2, foo = 3) works again, regression introduced in igraph 2.0.0 (#1247).
• sample_pa() respects the out.seq and out.dist arguments again, regression introduced in igraph 2.0.0 (#1226).
• isomorphisms() and subgraph_isomorphisims(method = "vf2") work again, regression introduced in 2.0.0 (#1219).
• biconnected_components() now returns edge and vertex sequences again, regression introduced in 2.0.0 (#1213).
• Remove zeros from the order and order.out components returned by dfs(), regression introduced in 2.0.0 (#1179).
• Memory leaks when converting data to C (#1196).

Features

• realize_bipartite_degseq() creates a bipartite graph from two degree sequences (#1212).
• is_biconnected() checks if a graph is biconnected (#1204).
• distances() now supports the Floyd-Warshall algorithm (#1186).

Documentation

• Use more culturally diverse names in intro vignettes (#1246).
• Formatting tweaks in introductory vignettes (#1243).
• Recommend {pak} instead of {remotes} (#1228).
• Fix typo in mean_distance() docs.
• Update troubleshooting document, emphasize issues with Anaconda environments (#1209).
• Improved docs for shortest path functions (#1201).
• Document "dsatur" heuristic for greedy_vertex_coloring() (#1206).
• Remove scg related docs (#1167).
• Fix typo in ?articulation_points (#1191).
• Improve installation and troubleshooting instructions (#1184).
• Improve docs of assortativity (#1151).

Testing

• Add tests for isomorphisms() and subgraph_isomorphisms() (#1225).

Packaging

• Always use bundled mini-gmp (#1233).
• config.h defines HAVE___UINT128_T (#1216).
• Do not rely on which program during configuration (#1232).
• configure manage libxml multiple include paths (#1197).
• Remove empty string in configure (#1235).
• Link Fortran runtime on Windows as needed by arpack. (#1215).
• Workaround for deprecated enum values not being supported with old GCC (#1205).
• HAVE_GFORTRAN flag for win and ucrt (#1171).
• make_empty_graph() is now fully auto-generated (#1068).
• Eliminate manual edits from autogenerated files (#1207).
• Add read-only comments for RStudio IDE (#1152).

Internal

• Remove unused patch files (#1234).
• Update stimulus to 0.21.4 (#1210).
• Avoid duplicate objects (#1223).
• Eliminate a compiler warning from simpleraytracer (#1185).