Address maintain_control_numbers() database function bug #677160

Address maintain_control_numbers() database function bug #677160

Jason Stephenson reported a bug handling records with multiple
001 or 003 fields, and supplied a set of test records to
reproduce the condition. The bug caused the ingest process
to throw a database error, rolling back the transaction and
preventing the actual ingest of those records.

The solution was to simplify the logic in maintain_control_numbers().
Now, in the case that there are either multiple 001s or 003s in the
incoming record, we simply delete all of the 003s and 001s and
create the desired 001 and 003. Also, if there are not exactly one
001 and one 003 in the incoming record, we do not try to preserve
one of those values in the 035 as it would be close to meaningless.

Many thanks to Jason for the clear bug report and test cases!

git-svn-id: svn://svn.open-ils.org/ILS/branches/rel_2_0@18811 dcc99617-32d9-48b4-a31d-7c20da2025e4