NEW:

- isfdb.org, dnb.de, OpenLibrary, Databazeknih:
  Added support for resolving author pseudonyms.
  Can be disabled in their settings.
- Bookshelves/Styles list editor improvement
- Identifier editor (for Advanced users)

FIXES:

- dnb.de workaround added for an ongoing certificate/security issue on the site.
- GitHub #137: dnb.de blocked requests without a 'referer'.
- GitHub #135: creating duplicate style names caused a crash
- fixes for Android 8..10 devices where merging Authors (etc) would sometimes fail.
