lookup and country parameters in Pyonionoo should not be case-sensitive
Pyonionoo shouldn't expect fingerprints to be upper-case. The specification wasn't clear there, so I just added that lookups are case-insensitive. Pyonionoo should accept lower-case, upper-case, and mixed-case fingerprints and treat them all the same.
The same applies to country codes which were specified to be lower-case. It doesn't make much sense to be restrictive there. We should simply ignore the case.
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