Bug 16245: [QA Follow-up] Replace typeofrecord2 by biblevel

Bug 16245: [QA Follow-up] Replace typeofrecord2 by biblevel

Position 7 of the leader is better referred to as biblevel.
(Pos 6 is record type.)
At the same time replacing some regex's by simple eq's.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
It seems that bib level in the UNIMARC leader only allows a subset of
the possible combinations for MARC21. This does not have bad side-effects
however in the new code that tests bib level to determine the type tag.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit 556a4870d6beced7df52dbbc2ad472769e79e148)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>