JBAS-1437 Linking script additions and repairs

JBAS-1437 Linking script additions and repairs

Teach the bib linker how to find the records to link instead of
requiring external batch files.

Remove aging perl docs.

Update and rename link-all-bibs-daily.sh to leverage the new bib
linker bib-finding parameters.

Remove no longer needed find-bibs-to-link script, which is superseded by
the above.

Update README to reflect changes.

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Adds a collection of common logging and DB utility to a new DB module
OpenILS::Utils::KCLSScriptUtil.

Updated various Backstage / linking scripts to use this new module.
More migrations to follow.

Auth2Auth gets --auth-mod-since

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