Update Requisition & Line Item Definitions

Requisition - add vendor alias field & select vendor button
Line Item - add new bib, existing bib radio buttons & bib search button
Update requisition bib-selection option definitions

.new_bib     -> .new_bib_option
.exiting_bib -> .existing_bib_option
(e.g., .new_bib_option.set)
Update changelog, fix new bib existing bib button definition