Fixing the mess I created

My 89a1ea2382a434d2887a72eb8d1f0cab7b0b09eb stomped on changes of @borkweb's in e4526606aa3010ba891ffa68f7fe6c99b51d130d , which would be bad enough, but this started with me misunderstanding what happened in @methnen's 2658a5bf71e2ffdab514b3d562a3547e1d50828c, which also deleteted @borkweb's changes...but only because of what happened in 8130141c0a651dffc4157402ea2bd21eadc1da47 .
It's save_post

Backng out the change from save_post to set_object_terms in 8130141c0a651dffc4157402ea2bd21eadc1da47 after @wluo identified and confirmed it as the cause of the problem we were seeing with tags disappearing.
Merge pull request #36 from misterbisson/fixing-my-bad

Fixing the mess I created
Merge pull request #37 from misterbisson/back-to-save-post

It's save_post
Merge branch 'master' of github.com:misterbisson/scriblio-authority