TPAC - hide subfield 6 and 8 from record title display

Record display previously showed every subfield associated with tag 245
to display the title in TPAC's record view.  Hide subfields 6 and 8
because they only show linkage information that does not contribute to
the actual title content.

Signed-off-by: Ben Shum <bshum@biblio.org>
Signed-off-by: Dan Scott <dscott@laurentian.ca>
TPAC: Prevent numeric subfields in series display

Series fields can theoretically contain linking subfields ($6, $8) and
other numeric subfields that aren't meant to be displayed. So, do not
display them.

Signed-off-by: Dan Scott <dscott@laurentian.ca>
Signed-off-by: Ben Shum <bshum@biblio.org>