[issue6517] configparser: add possibility to escape formatstrings

[Till Maas]

Till Maas <opensource at till.name> added the comment:

It would be nice if you could expand the patch to also use only one name
for the support of format strings.

In the beginning it is introduced as "reference expansion", but later in
the document, several variatons of interpolation are used: "magical
interpolation", "string interpolation", "%" interpolation is used.
Therefore I guess it should also be introduced as interpolation.

Another nice improvement would also be to move the ConfigParser to a
"deprecated classes" section at the end like it is done for some methods
in the string module.

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<http://bugs.python.org/issue6517>
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