Add Schematron for trailing punctuation in name tags

[martindholmes]

There are lots of cases of e.g. trailing commas included in <persName> tags; Find and fix all these, then add a Schematron rule to prevent them.

[martindholmes]

Refining this a bit, we should catch all cases of names with trailing comma, semicolon, or colon; and we should catch cases where a final period is not preceded by a capital letter (i.e. someone's initials). There are many, many bad instances to catch before we can add the Schematron. Tags such as gloss and term should also be included.

[JanelleJenstad]

Refining the refinement: "we should catch cases where a final period is not preceded by a capital letter (i.e. someone's initials)" -- We will have cases where persName wraps around names like these ones: Boba Fett, Jr. or Boba Fett, Esq. So our rule cannot be looking for capital letters before periods.

[martindholmes]

Good point. I've added a Schematron rule to catch commas, but right now it's ignoring <ref> elements because there are too many existing errors to fix. We can refine later; we can probably add a bunch of different punctuation marks, even if we can't frame a rule that catches periods.