options for excluding certain items

options for excluding certain items

by internal item id's and by barcodes.

    --exclude-item-id-file=<file containing list of item ids, one per line>
    --exclude-item-barcodes-file=<file containing list of item barcodes, one per line>

Works in conjunction with --exclude-itemless-bibs, so if that argument is in effect and
all items on a given bib are effectively filtered out via an --exclude-item argument,
then the bib itself will not be included in the output.

Signed-off-by: Jason Etheridge <jason@esilibrary.com>