Regenerate MODS due to metadata and mapping changes

-) Secondary titles are now mapped to <titleInfo type=...>
-) Changes to mapping of Omeka ID and CLIO ID
-) Metadata changes to most of the titles.
-) Addditional metadata which maps to <extent>
-) Changes to metadata which maps to <placeTerm>

Above list may not be complete. To see all changes, please git diff
this commit against the previous commit in history.