Fix context processing for reverse terms

[niklasl]

This changes the algorithm for processing a reverse term so that it doesn't return early. Fixes #565.

Includes one test for expansion using a reverse term with @container: @index and @index set to a property, and a roundtripping compaction test based on the former.

(Note: the round-tripping compaction test reuses the expand test data. That does not seem to be the practise; is there any rationale against that?)

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[davidlehn]

Does this need parallel toRdf tests too? t0131 is not going to line up between expand/toRdf since there already exists some toRdf tests over 0130. Not sure if some other prefix would be better here for that reason alone.

[gkellogg]

Yes to @davidlehn’s points. Also, there should be an entry in the “changes since Recommendation …” section.

[niklasl]

Yes to @davidlehn’s points. Also, there should be an entry in the “changes since Recommendation …” section.

Added an entry about this change in 8bfdf28.

[niklasl]

Does this need parallel toRdf tests too? t0131 is not going to line up between expand/toRdf since there already exists some toRdf tests over 0130. Not sure if some other prefix would be better here for that reason alone.

Added toRdf#t0133 in fb521b7.

The numbering of "non-prefixed" toRdf tests don't seem to correlate with neither expand nor compact test numbering, so I just continued on the non-prefixed sequence rather than using any "prefix". (The "prefixed" ones did seem to correlate, but I didn't see any obvious naming to use.)

[niklasl]

Note that I added textual references in the purpose text to the original expand test id. We should consider adding proper interlinking of all tests instead, so we can query on what is based on what, and if there are any missing round-trip or to/from RDF tests. That would be a separate task of course.

[dlongley]

This seems ok to me and like an oversight previously.

[TallTed]

Trivial, but important.