test for the Set(1) === Set.empty[Int] regression
started modifying the toc to build it from a tree of pages
don't fill an exception stacktrace unless necessary
better nesting for the toc
better image for intellij
links created with spec structures in s2 contexts must be see links
introduce specification reference instead of specification link
report missing see refs
fixed the added/missing message for differences on lists and sets
added a transitive closure algorithm
reworked the links and see references
added the `all` argument description
added more space for the toc
added a parameter to control the max size of a toc entry
adjustements to titles margins