[Distutils] buildout WHUI heads up

[Jim Fulton]

This is a heads up that I'm going to call "we haven't used it!"
on a couple of buildout features.  The next release of buildout
will not support ConfigParser-style variable substitutions
(e.g. %(foo)s). Only the string-template style of variable
(e.g. ${section:option}) substitutions will be supported.
Supporting both violates "there's only one way to do it".

I'm deprecating the buildout-section extendedBy option.
Ian suggested to me a while ago that this wasn't needed
and I've come to agree with him.

If anyone is using these features and will have pain
by having them disappear, please let me know.  It will be
at least a couple of days, probably more, before I make
a new release.

Jim

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