Fix issue #43 on ubuntu 20.04 with xmllint 20910 and debian buster with xmllint 20904

The solution is a change in the call to xmllint, as shown here. The string function returns a utf8 encoded string of the content in the older and new xmllib-versions.

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• 4f1e5a34 - Update bin/numapde-query-arxiv.sh

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mentioned in commit 9ba96a11