do not let MARC::Batch open MARC files

do not let MARC::Batch open MARC files

The version of MARC::Batch->new() distributed with version
2.0.0 of MARC::Record, if given a file name, will
open it using the ':utf8' layer.  This results in an
incorrect character conversion when processing records
in the MARC-8 character encoding.

To avoid this, batch jobs that use MARC::Batch now
open the file themselves, then pass the file handle
to MARC::Batch->new().

Signed-off-by: Joshua Ferraro <jmf@liblime.com>