rework configuration system to not dangerously save state #1555
Description
The specific plans for this are detailed in an astropy-dev post: https://groups.google.com/forum/#!topic/astropy-dev/KW1bf4bLGW4
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The specific plans for this are detailed in an astropy-dev post: https://groups.google.com/forum/#!topic/astropy-dev/KW1bf4bLGW4