Ldapper v0.2.1

Three bugs found by pointing Ldapper at a directory built to be awkward rather
than tidy. All three are the kind that only show up against real data.

Fixed

• A comma inside a name was shown as its escape sequence. Volkova, Anna
  came back from the server as Volkova\2C Anna — or Volkova\, Anna,
  depending on the server — and the tree showed it that way. Names are now
  unescaped for display while the distinguished name keeps its escapes, which
  is what makes it usable as an identifier.
• CSV could not be read back reliably. Multiple values were joined with
  "; ", so a single value that happened to contain a semicolon looked
  identical to several values. Values are now separated by newlines inside the
  quoted field, which a spreadsheet shows as line breaks and a CSV reader
  parses back exactly.
• The built-in "empty groups" filter never matched anything. It looked only
  at group and groupOfNames, and both require a member by schema — a
  genuinely empty group is almost always a posixGroup. The filter now covers
  that case, and uniqueMember besides.

Also in this release

dev/directory/ — a generator and a compose file for a directory worth
exploring: 2594 entries, groups of 3 to 500 members, POSIX accounts, 60
computers, and the awkward cases that found the bugs above. A comma inside a
name, Cyrillic in every field, semicolons inside a value, a 900-character
value, and an entry missing an attribute the table has a column for.

docker compose -f dev/directory/docker-compose.yml up -d --wait

Then connect to localhost:4389 as cn=admin,dc=example,dc=com with the
password adminpassword.

Verified

311 unit tests and 37 integration tests, the latter now including an entry
whose name contains a comma — checked all the way from the server to the label
the interface would draw. Everything above was also confirmed by hand against
the development directory: 2508 people paged in three round trips, a
500-member group exported in full, a 900-character value surviving LDIF, and
Cyrillic base64-encoded correctly.