Issue #19036: Including locale.h should not depend on HAVE_LANGINFO_H.
Issue #20315: Removed support for backward compatibility with early 2.x versions.
Issue #20262: Warnings are raised now when duplicate names are added in the
ZIP file or too long ZIP file comment is truncated.
Issue #20311: select.epoll.poll() now rounds the timeout away from zero,
instead of rounding towards zero. For example, a timeout of one microsecond is
now rounded to one millisecond, instead of being rounded to zero.
Issue #20311: Try to fix the unit test, use time.monotonic() instead of
time.perf_counter()

Move also the unit test at the end.
Issue #20222: file is no longer a builtin in 3.x.
Issue #20122: Idlelib: Move tests in CallTips.py to test_calltips.py.