Lp 1730726: Basic Patch to build the database with PostgreSQL 10.

Lp 1730726: Basic Patch to build the database with PostgreSQL 10.

* Modify the evergreen.org_top() function, with code from Galen
  Charlton, to be non-set returning.

* Modify Open-ILS/src/support-scripts/eg_db_config.in to not strip the
  period from PostgreSQL version numbers and to use the first two
  components when checking for supported PostgreSQL versions.

* Add link from Open-ILS/src/sql/Pg/000.english.pg94.fts-config.sql
  to Open-ILS/src/sql/Pg/000.english.pg10.fts-config.sql.

Signed-off-by: Jason Stephenson <jason@sigio.com>
Signed-off-by: Ben Shum <ben@evergreener.net>