Name search field entries include "role" value, bloating metabib.author_title_field_entry

[Dan Scott]

* Evergreen master as of 2014-02-08
* PostgreSQL 9.1 / 9.3
* Ubuntu 12.04 / Fedora 20

metabib.author_field_entry is currently populated with approximately twice as many rows as it should be, and includes extraneous text ("creator"). This is a problem because of table/index bloat and because a search for "creator" will result in wrong results and likely cause a table scan.

The current definition of the author:personal index field is:

8 | author | personal | Personal Author | //mods32:mods/mods32:name[@type='personal' and mods32:role/mods32:roleTerm[text()='creator']]

The MODS32 name section looks like the following:

<name type="personal">
  <namePart>Girdlestone, Cuthbert Morto</namePart>
  <namePart type="date">1895-1975</namePart>
  <role><roleTerm authority="marcrelator" type="text">creator</roleTerm></role>
</name>

The entries that we see in metabib.author_field_entry look like:

evergreen=# select id, source, field, value from metabib.author_field_entry WHERE value ~ 'Girdles';
 id | source | field | value
----+--------+-------+------------------------------------------------
  5 | 3 | 8 | Girdlestone, Cuthbert Morton 1895-1975
  6 | 3 | 8 | Girdlestone, Cuthbert Morton 1895-1975 creator

So we need to be grabbing /name/namePart and not /name/role ...