pep8/linter whitespace cleanup
update simple keyword search form with digital object filter input [#46926205]
display new digital object filter on single-document search form [#46926205]
depend on dev eulexistdb to use new filters for digital object search [#46926205]
update document search view to filter on public daos when selected, only filter on keyword when set [#46926205]
new template snippet for file-level item display, for re-use in container list and document search results [#46926205]