IGraph/M

This is a maintenance release, recommended for all users.

Changed:

• When an invalid vertex is passed to IGraph/M functions, now the message shown is IGraphM::invv instead of VertexIndex::inv.

Fixed:

• In rare cases, vertex names that were lists of other vertex names in the same graph were misinterpreted. This affected only Mathematica 12.0 and later.
• IGCommunitiesLeadingEigenvector is less likely to fail to converge now.
• IGCommunitiesLeadingEigenvector now respects random seeds set in Mathematica. These affect only the random starting vector it uses internally, which can very rarely cause non-deterministic output.
• IGBarabasiAlbertGame no longer accepts negative or zero exponents, as these were not handled correctly.
• IGBridges is no longer prone to stack overflow when given very large graphs.

Other:

• Performance improvements for IGGraphEditor.
• Documentation improvements.