hgweb: use parsebool for parsing diff query string options Differential Revision: https://phab.mercurial-scm.org/D875

hgweb: remove extra </div> This was accidentally added in 6797f1fbc642. Differential Revision: https://phab.mercurial-scm.org/D880

tests: add "have" check for dpkg builddeps Differential Revision: https://phab.mercurial-scm.org/D879

tests: expect parsers.so in cext, parsers.py in pure (test-debian-packages) Differential Revision: https://phab.mercurial-scm.org/D878

hghave: check for debuild being installed as well Differential Revision: https://phab.mercurial-scm.org/D874

changelog: use attrs instead of namedtuple See http://www.attrs.org/en/stable/why.html#namedtuples for why attrs are better than namedtuples. Differential Revision: https://phab.mercurial-scm.org/D868

thirdparty: vendor attrs The attrs package allows defining namedtuple-like classes with no weird behavior and no runtime performance cost. This patch vendors in attrs 17.2.0. # no-check-commit Differential Revision: https://phab.mercurial-scm.org/D867

python3: don't byte mangle third-party packages Third-party packages are already expected to be dual-version clean. Differential Revision: https://phab.mercurial-scm.org/D871

tests: disable lints on mercurial/thirdparty In the next patch, this directory will be used to vendor in some third-party code. Differential Revision: https://phab.mercurial-scm.org/D866

hghave: fix dpkg --version check to work on recent dpkg versions Differential Revision: https://phab.mercurial-scm.org/D869