Fix all diff_checker related errors in pywikibot/**

Change-Id: I01354c293744eb5a9c079cd5c6d7fd29323f8e7b
---
M pywikibot/__init__.py
M pywikibot/bot.py
M pywikibot/bot_choice.py
M pywikibot/botirc.py
M pywikibot/comms/http.py
M pywikibot/comms/threadedhttp.py
M pywikibot/compat/query.py
M pywikibot/config2.py
M pywikibot/cosmetic_changes.py
M pywikibot/data/api.py
M pywikibot/data/sparql.py
M pywikibot/data/wikistats.py
M pywikibot/date.py
M pywikibot/diff.py
M pywikibot/echo.py
M pywikibot/editor.py
M pywikibot/exceptions.py
M pywikibot/families/i18n_family.py
M pywikibot/families/omegawiki_family.py
M pywikibot/families/osm_family.py
M pywikibot/families/vikidia_family.py
M pywikibot/families/wikia_family.py
M pywikibot/family.py
M pywikibot/fixes.py
M pywikibot/i18n.py
M pywikibot/interwiki_graph.py
M pywikibot/logentries.py
M pywikibot/logging.py
M pywikibot/login.py
M pywikibot/page.py
M pywikibot/pagegenerators.py
M pywikibot/plural.py
M pywikibot/proofreadpage.py
M pywikibot/site.py
M pywikibot/site_detect.py
M pywikibot/specialbots.py
M pywikibot/textlib.py
M pywikibot/throttle.py
M pywikibot/titletranslate.py
M pywikibot/tools/__init__.py
M pywikibot/tools/_logging.py
M pywikibot/tools/ip.py
M pywikibot/userinterfaces/gui.py
M pywikibot/userinterfaces/terminal_interface_base.py
M pywikibot/userinterfaces/transliteration.py
M pywikibot/userinterfaces/win32_unicode.py
M pywikibot/version.py
M pywikibot/weblib.py
M pywikibot/xmlreader.py
M tox.ini
50 files changed, 1,475 insertions(+), 1,413 deletions(-)