Adjust sortable columns for source list page (based on email feedback) #1618
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Makes some changes to the columns for institution and source identification on the source list page.
Columns "country", "city + institution", and "source" are sortable and contain the holding institution country, the holding institution city and name, and the holding institution siglum and source shelfmark respectively.
Also adds tests for ordering of the source list page.
Closes #1616