S3 method for all.equal that compares caugi objects by their
graph content (nodes, edges, simple, class) rather than session identity.
This is used by testthat edition 2.
# S3 method for `equal.caugi::caugi`
all(target, current, ...)TRUE if equal, or a character vector describing differences.
A caugi object.
A caugi object.
Additional arguments (ignored).