Improve POD
prep.sh was replacing newlines in the records file when it should be the items file
Make items.pl get ccode mapping from YAML file, add --f096b option

Translate values from 096$b in BIBSYS to CCODE authorized values,
using ccodes.yaml in the config dir.

Add --f096b option, which prints values from 096$b and the frequencies
with which they occur.