preparing for initial import

* --descriptor-dump, --data-split-by-tab, --data-split-by-comma
and utility functions (copied from tconsole.pl, maybe should move
to separate CPAN module; Yandex::Tools? rename to Kohts::Tools?)

* populating $storage_struct->{'status'}, $storage_struct->{'date_of_status'},
$storage_struct->{'scanned_doc_id'} in tsv_read_and_validate()

next step: simply reproducible clean dspace database to test
csv imports