LP1071505 - Add 264 RDA tag to TPAC pubinfo display

Prior to this, TPAC only retrieved the 260 tag for publication info. Allow for
the possibility that the 264 tag might exist and contain relevant information.
Special note: the 264 tag must have a second indicator value of 1 to be meant
for publication statement.

Also, this only picks out the first 260 or 264 tags in any given bib record.

Approach inspired by Dan Scott's approach taken for finding edition statements.

Signed-off-by: Ben Shum <bshum@biblio.org>
Signed-off-by: Dan Wells <dbw2@calvin.edu>