Issue #17857: Prevent build failures with pre-3.5.0 versions of sqlite3,
such as was shipped with Centos 5 and Mac OS X 10.4.

This bug was already fixed in issue14572 for 2.7 only and then it was
backported back from 3.3 in issue17073.
Issue #17842. Added base64 module tests with bytearray arguments.
#7152: Clarify that ProxyHandler is added only if proxy settings are detected.

Behavior confirmation and initial patch by Jessica McKellar.
Reflow paragraph.
Issue #17843: Remove bz2 test data that triggers antivirus warnings.
Add missing NEWS entry for issue #17843.
#7152: Remove incorrectly added reference to DataHandler.