Multi-bug fix - SetMarcUnicodeFlag for records coming from Koha

Multi-bug fix - SetMarcUnicodeFlag for records coming from Koha

This has bearing on bugs 2905, 2665, 2514 and other "wide character" crashes
related to diacritics and Unicode.  This should help open the door for reliable
input of diacriticals via acquisitions.

MARC21_utf8_flag_fix.pl diagnoses and fixes existing problems with MARC data
affected by the bug.

Adding SetMarcUnicodeFlag to TransformKohaToMarc prevents the bug from corrupting
further data.

Signed-off-by: Galen Charlton <galen.charlton@liblime.com>
Signed-off-by: Henri-Damien LAURENT <henridamien.laurent@biblibre.com>