Add bib record mix-in

Create a Mix-In module to fill out a bib record in the Marc Editor
Load mix-in modules on smoketest start
Use bib record mix-in in bib editor test
Use create bib mix-in in PURAP Workflow Test
Use bib editor mix-in for Describe Test
Use bib editor mix-in for Loan/Return Test
Update comments in Marc editor mix-in