This patch resolves a few MARC21 Framework issues for

This patch resolves a few MARC21 Framework issues for
a default installation:

1. Re-names several of the item fields to make more sense to catalogers and patrons
2. Remove links Non-public note from items.paidfor
3. Changes Non-public note to be hidden in the OPAC view

Fixes issues with the 'hidden' field in the framework, specifically:

1. the editor obeys the rules of possible values for hidden (>4, or <-4)
2. the OPAC MARC display obeys the rules of positive values meaning 'hidden in OPAC'
3. the staff MARC display now obeys the rules specified in the hidden values description