new function for "list" type queries

[Jon South]

This is a new function to be used in CONFIGURE to allow lists of answers 
(where yes or no would not work) for a single option. As an example, the 
attached apache2 module diff uses it to select an MPM module (prefork or 
worker).

I've tested it and it works okay, and should support any number of 
options. Constructive criticism, critiques, suggestions, opinions, 
arguments, quarrels, flames, and insults are all welcome.

-Striker
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