Utility to stage and overlay bib records in an Evergreen database. This
expects that the incoming records will have been previously exported
from that Evergreen database and modified in some fashion (e.g., for
authority record processing) and that the bib ID can be found in the
901$c subfield.

This program has several modes controlled by the --action switch:

  --action stage_bibs  - load MARC bib records into a staging table
  --action filter_bibs - mark previously staged bibs that should
                         be excluded from a subsequent load, either
                         because the target bib is deleted in Evergreen
                         or the record was modified after a date
                         specified by the --cutoff switch
  --action load_bibs   - overlay bib records using a previously staged
                         batch, one at a time. After each bib, it will
                         wait the number of seconds specified by the
                         --wait switch.

  --action stage_auths          - load MARC authorities into staging
                                  table
  --action match_auths          - identify matches with authority
                                  records already present in the
                                  Evergreen database; matching is
                                  based on LCCN, cancelled LCCN, and
                                  main heading.
  --action load_new_auths       - load new (unmatched) authorities
  --action overlay_auths_stage1 - overlay based on LCCN where
                                  heading has NOT changed; this step
                                  disables propagation to bib records
  --action overlay_auths_stage2 - overlay based on LCCN where heading
                                  HAS changed; propagates changes
                                  to bib records
  --action overlay_auths_stage3 - overlay for records where a cancelled
                                  LCCN is replaced with a new one
  --action link_auth_auth       - run authority_authority_linker.pl for
                                  the authorities that were overlaid
                                  or added in this batch.
  --action link_auth_bib        - run authority_control_fields.pl for
                                  the bibs that were overlaid in this
                                  batch.  Add --link-skipped to specify
                                  that bibs that were matched but
                                  skipped due to having be edited after
                                  the cutoff should be linked (rather
                                  than linking the imported bibs)
  --action export_skipped_bibs  - export to ISO2709 file whose name is
                                  specified by --output those bibs
                                  that had been edited after the cutoff.
  --action export_skipped_auths - export to ISO2709 file whose name is
                                  specified by --output those authorities
                                  that could not be definitively
                                  handled as updates or adds.
  --action report               - output a summary of the processing of the
                                  batch.

Several switches are used regardless of the specified action:

  --schema      - Pg schema in which staging table will live; should be
                  created beforehand
  --batch       - name of bib batch; will also be used as the name
                  of the staging tables
  --db          - database name
  --dbuser      - database user
  --dbpw        - database password
  --dbhost      - database host
  --osrf-config - path to OpenSRF core configuration file. Defaults
                  to /openils/conf/opensrf.xml
  --eg-bindir   - directory containing Evergreen's scripts. Defaults
                  to /openils/bin

Examples:

./eg_staged_bib_overlay --schema bib_load --batch bibs_2016_01 --db evergreen \
   --dbuser evergreen --dbpw evergreen --dbhost localhost \
   --action stage_bibs -- file1.mrc file2.mrc [...]

./eg_staged_bib_overlay --schema bib_load --batch bibs_2016_01 --db evergreen \
   --dbuser evergreen --dbpw evergreen --dbhost localhost \
   --action filter_bibs --cutoff 2016-01-02

./eg_staged_bib_overlay --schema bib_load --batch bibs_2016_01 --db evergreen \
   --dbuser evergreen --dbpw evergreen --dbhost localhost \
   --action load_bibs --wait 2