Proof of concept for loading cycle list definitions from separate files ... #3
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...using the 'cycle list name' key. This is an attempt to address issue #2.
When 'cycle list name' is called, we first check whether that cycle list is already defined. If it isn't, we check whether a file with the cycle list name exists. If it does, we construct the cycle list from that file, using code provided by Christian Feuersänger at http://tex.stackexchange.com/a/32064/2552. If it doesn't, we display an error message.
This is only a proof of concept, only the "YlGn-3" and "Set1-4" cycle lists are defined.