[issue6517] configparser: add possibility to escape formatstrings

[Łukasz Langa]

Łukasz Langa <lukasz at langa.pl> added the comment:

This issue superseeds #8888 because of the patches attached.

Brett, there are two ways we can solve this issue:

1. Rewrite the documentation so it clearly puts more emphasis on the fact that SafeConfigParser is the one to choose.
2. We deprecate ConfigParser in the code and in the documentation.

I personally would go with 1. and maybe just "hint" about the fact that ConfigParser is not for end users. Formal deprecation seems too big for this since the regular ConfigParser still does have its valid use cases.

Please decide on what we're going to do and I'll edit the docs and add the tests here to py3k.

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nosy: +brett.cannon, lukasz.langa

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