Tighten who writes and reviews a record, date the rules, bound history (review of #206)

A revision came from anyone and a review was refused only to the first author,
so a co-writer could approve, and a record proposed before callers are proven
would later be reviewable by its own unproven author. Now a revision is taken
only from the proven author, a reserved number only from whoever reserved it,
and a review is refused from any writer of any version or for any record with
an unproven writer. The rules held records from no date, so a correction to an
older record was refused by rules hq never held it to; each dated rule now holds
from hq's own start date, and a new record cannot be dated before its
reservation. history and the question to ask are bounded like the other answers.

modules/mesh-knowledge/cmd/mesh-knowledge/review_test.go

@@ -29,7 +29,7 @@ func TestAReviewByTheAuthorIsRefused(t *testing.T) {
 		w := imported(t, s)
 		n := proposed(t, w, "author@g14", false)
 		_, err := w.k.Review("author@g14", ReviewAsk{Kind: KindDecision, Number: n, Verdict: VerdictApprove})
-		if err == nil || !strings.Contains(err.Error(), "someone who did not write it") {
+		if err == nil || !strings.Contains(err.Error(), "someone who wrote none") {
 			t.Fatalf("a review by the author: %v", err)
 		}
 		if e := mustGet(t, s, Key{KindDecision, n}); e.Current.Status != StatusProposed || len(e.Current.Reviews) != 0 {