[issue6517] configparser: add possibility to escape formatstrings

[Fred L. Drake, Jr.]

Fred L. Drake, Jr. <fdrake at acm.org> added the comment:

I disagree.

The documentation should promote RawConfigParser, and note
SafeConfigParser and ConfigParser as remaining for backward
compatibility for existing software.  Maintainers of legacy software
using ConfigParser should be encouraged to convert to SafeConfigParser
(or even RawConfigParser) if possible.

Documentation changes should be sufficient; deprecation warnings
typically generate more pain than good.

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