* Positive wording for the description of why < and > and = can all
be False.
* Move to a three column table format that puts long method names
side-by-side with their operator equivalents
* Mention that KeyError can be raised by Set.pop() and Set.remove().
* Minor tweaks to the examples.
Will backport as soon as Fred rebuilds the docs so I can confirm
the tables formatted properly
underlying dictionaries, there were no reasonable use cases (lexicographic
sorting of a list of sets is somewhat esoteric). Frees the operators
for other uses (such as strict subset and superset comparisons).
Updated documentation and test suite accordingly.