We can't stack a random set of entries into a cfg[] because we don't
want to allocate memory in the API. Instead, whenever a method's
arguments are reconfigured, re-build the base configuration string by
appending the new configuration, and re-build the checks array, that way
we always have a single base configuration string and a single checks
array.
Re-work how we're handling lists, we can't expect the application to
crack them, they can be seriously messy. If it's a list, create an
array of NULL-terminated refrences to nul-terminated strings (create
an "argv" array, in other words). It's ugly, and the user has to free
the memory, but I don't see an alternative.
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