MARC import tag stripping : SQL / IDL

MARC import tag stripping : SQL / IDL

* Adds a new table vandelay.import_bib_trash_group for grouping "trash"
  fields.  Groups may be optional or "always_apply".  Always-apply groups
  contain MARC fields which are to be unconditionally removed during
  import.

* Updates vandelay.import_bib_trash_fields for putting them into groups.

* IDL changes to accommodate the above

Signed-off-by: Bill Erickson <berick@esilibrary.com>
Signed-off-by: Mike Rylander <mrylander@gmail.com>