many properties assumed in back-compat that are not listed as backcompat values

[dissolve]

https://github.com/microformats/tests/blob/master/tests/microformats-v1/hnews/all.json backcompats principles, entry, dateline, source-org, and geo despite hnews not being listed in backcompat at all

https://github.com/microformats/tests/blob/master/tests/microformats-v1/hcard/multiple.json adds sound, mailer, and agent

https://github.com/microformats/tests/blob/master/tests/microformats-v1/hcard/single.json adds sort-string

[dissolve]

also adds "class" in that last example