CID 1131949:  Dereference null return value  (NULL_RETURNS)

Most of the work is by Alexandre.

#13633: Added a new convert_charrefs keyword arg to HTMLParser that, when True, automatically converts all character references.

a new SSLContext object with secure default settings.

Issue #19715: try the utime(..., None) approach again, now that it should be more precise under Windows

a year before 1900.

Patch by William Mallard.

Patch by Kushal Das.

certificates from default stores or system stores. By default the method
loads CA certs for authentication of server certs.