Irclog2html

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- Support `ii <https://tools.suckless.org/ii/>`_ logs which use Unix
timestamps (https://github.com/mgedmin/irclog2html/pull/21).
Pull request by Cédric Krier.

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- Support Python 3.6.

- Fix for duplicated lines with the same time where the resulting HTML ``id``
anchors would evolve into long form like "t22:24:49-2-3-4-5-6-7-8-9-10"
instead of "t22:24:49-10" resulting in significant output file size growth
in some cases.

- Add --output-dir (-o) parameter to logs2html so you can place the generated
HTML files in a directory different from the input directory (`PR 20
<https://github.com/mgedmin/irclog2html/issues/#20>`_).

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- In some circumstances parts of a message up to the last '>' could be lost
(https://github.com/mgedmin/irclog2html/issues/19).

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- ``irclogserver`` channel list is now split into old channels and active
channels, detected by checking whether the directory modification date
is newer or older than 7 days.

- 2nd-level headings now have the same color as 1st-level headings.

- ``irclogserver`` no longer shows a 404 if you omit the trailing ``/``
after a channel name in the URL.

-------------------

- Lines with the same timestamp now get different HTML anchors
(https://github.com/mgedmin/irclog2html/issues/17). Thanks
to Bryan Bishop for the original pull request.

-------------------

- There's a new ``irclogserver`` script that can be used to serve
dynamically-generated IRC logs and perform search. It can also be
deployed via WSGI. Portions contributed by Albertas Agejevas
(https://github.com/mgedmin/irclog2html/pull/9).

- Index pages group the logs by month
(https://github.com/mgedmin/irclog2html/issues/12).

- Drop support for Python 2.6.