bug 2926: fix staging import hang

bug 2926: fix staging import hang

Fixes a hang of the staging import tool when it
attempts to process a MARC21 record that claims
that it's UTF-8 when it is not.  The staging import
will now attempt to fix the character encoding of such
records.

Also added a FIXME to bulkmarcimport.pl, which because
of its use of MARC::Batch will skip over such records -
better than the original hang of the staging import, but
worse than the staging import's new ability to fix such
records.

Signed-off-by: Galen Charlton <galen.charlton@liblime.com>