JBAS-2098 Migrate browse data back to stock tables

JBAS-2098 Migrate browse data back to stock tables

Move data from the various
metabib.browse_[title|author|subject|series|call_number]_entry_* tables into
the stock metabib.browse_entry_* tables.

The data migration step handles de-duplication and creation of entry,
def_map, and simple_heading_map rows.

UI code is updated to refer to the stock tables as well.

Some local additions added to improve stock browse speed and resolve
index-size issues (combo_sort_value field, metabib_fields_cache field,
and substr indexes).

Includes updates to the new headings report to reference the new tables,
including a materialized view to speed up the initial report collection.

Signed-off-by: Bill Erickson <berickxx@gmail.com>