Fixed

• Eliminated references to exit() from the igraph shared library. These were accidentally introduced into igraph 1.0.0 through Qhull and Infomap.
• Eliminated references to std::cout from the igraph shared library, as required by CRAN.
• Fixed a bug in igraph_hub_and_authority_scores() that printed a warning about zero entries in the result even when the number of zeros was below the threshold used in the corresponding checks.
• Fixed compilation and tests when Infomap support is disabled.
• Fixed rare compilation issues on some Apple systems with some non-standard compilers due to incompatibilities between defining the _POSIX_C_SOURCE feature test macro and standard C++ headers. Now _DARWIN_C_SOURCE is defined when compiling igraph on Apple systems.
• Fixed inconsistent libf2c prototypes for s_copy() and s_cat(). This restores compatibility with emscripten.

Other

• Documentation improvements.
• nanoflann was updated to version 1.9.0

Full Changelog: 1.0.0...1.0.1