* src/dn.cpp (struct NameAndOID): Remove.
(oidmap): Replace static vector with function returning the vector.
(attributeNameForOID): Support OIDs prefixed with "OID." or "oid.".
(struct DnPair, digitp, hexdigitp, xtoi_1, xtoi_2,
trim_trailing_spaces): Remove.
(removeLeadingSpaces, removeTrailingSpaces, xtoi, parseHexString): New.
(parse_dn_part): Rewrite. Add support for values in double quotes.
Improve error handling.
(parse_dn(const unsigned char*)): Rename to...
(parseString): ...this. Work on std::string_view instead of
const char *. Change return type.
(parse_dn(const QString &)): Work on std::string_view instead of
QString. Change return type.
(DN::DN(const QString &), DN::DN(const char *)): Pass std::string_view
to parse_dn.
* tests/CMakeLists.txt: Add new test.
* tests/t-dn.cpp: New.