parser for ISO 2709 encoded MARC records

 MARC::Parser::RAW is a lightweight, fault tolerant parser
 for ISO 2709 encoded MARC records.
 Tags, indicators and subfield codes are not validated
 against the MARC standard.
 Record length from leader and field lengths from the directory
 are ignored.
 Records with a faulty structure will be skipped with a warning.
 The resulting data structure is optimized
 for usage with the Catmandu data toolkit.