Changes to backport (as compared to rc3 = 1ff1cec):
[x] 1f8d57e [FIX] Stop crashing item loads due to support of units
[x] a8a6b25 [FIX] Handle single quotes in usernames on Travis
[x] 103d708 [FIX] Allow apostrophe in password
[x] 4e78c27 [FIX] checkimages: Expect NoPage exception
[x] 7944b92 Remove Python 2.6 from the build matrix
[x] e657be5 Updated pywikibot/core Project: pywikibot/i18n f7f53ecfff68adf651d9bd904be32bc4aa7793d9
[x] c19dcfa __all__ items must be bytes on Python 2
[x] e6aa6ca Omit includeredirects parameter for allpages generator
[x] 687ec9e Performance fix for sites using interwiki_putfirst option
[x] 28db3d2 Persian Wikipedia configuration in wikipedia_family.py
[x] a305d7b Allow titletranslate.translate page to be None
[x] a786226 '-ignore' parameter throws exception in interwiki.py
[x] 3944f5e [FIX] rollback: Use Revision instance properly
[x] 860af34 Add must_be to DataSite write actions
[x] bf49a7d Fix ComparableMixin
[x] 1d36e45 Deprecate ParamInfo.query_modules_with_limits
[x] e83c6a3 be-x-old is renamed to be-tarask
[x] ab7abf5 interwiki.py: check for category before emptiness
[x] 19bbe7e Correctly identify qualifier from JSON
[x] 0db2e87 interwiki: do not automatically log in