Add method to sequences that takes another sequence and a comparison predicate, assumes both sequences are sorted along that predicate, and reports how much the sequences overlap in element values.  Add an overload that defaults the comparison to the standard less-than operator.  Add a type to express the form of set overlap, making optional distinction to degenerate sources.

Rename the type expressing kinds of set overlap, to be less general.  Explicitly list the preconditions for the set-overlap detection methods.

Forgot to update a file for a type rename from the last change.

Add a reference to the pull-request link. Change location of summary.

Change the name of the "sortedOverlap" methods to "degreeOfInclusion," to clarify what is being calculated.

Change the name of the source, test, and guide files to match the updated method name. Update their link in the README file.

Change some paragraphs with better explanations on design and usage. Change punctuation spacing to match the project's style.