Edit summary: use taxac only

Edit summary: use taxac only

Edit summary: Delete remaining orphaned ReferenceDocuments, see GitHub #1310

Edit summary: Split and convert; other parts here: https://antcat.org/history_items/297309, https://antcat.org/history_items/297310

Edit summary: Extracted from https://antcat.org/history_items/278818

Edit summary: Extracted from https://antcat.org/history_items/278818

Edit summary: fix document URL

Edit summary: fix document URL

Edit summary: fix document URL

Edit summary: update for v3.7.8.1

Edit summary: Re-use/rescue orphaned ReferenceDocuments with hardcoded "antcat.org" urls pointing to them (re-run), see GitHub #1307

Edit summary: Delete orphaned ReferenceDocuments without files on S3 (that is, only url), see GitHub #1291

Edit summary: Re-use/rescue orphaned ReferenceDocuments with hardcoded "antcat.org" urls pointing to them, see GitHub #1307

Edit summary: fix spacing

Edit summary: De-duplicate documents of nested references (same filename), see GitHub #1301

Edit summary: De-duplicate documents of nested references (hardcoded URL points to parent document), see GitHub #1301

Edit summary: De-duplicate documents of nested references (same URLs), see GitHub #1301

Edit summary: restore

Edit summary: update for v3.7.7.4

Edit summary: update for v3.7.7.3

Edit summary: update for v3.7.7.2

Edit summary: Nillify blank-string reference_documents.urls, see GitHub #1287

Edit summary: Blank urls of PDFs with files on S3, see GitHub #1283

Edit summary: update for v3.7.7.1

Edit summary: Blank urls of ReferenceDocument where the url is the same as url_via_file_file_name, see GitHub #1274

Edit summary: Delete blank ReferenceDocuments, see GitHub #1273