Add support for correct sorting with other call numbers #30
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Supported schemas besides DDC, LoC are now also RVK, BK and some simple Numerus Currens call numbers. Test for all new cases are also added. See also the initial discussion in the forum https://forums.zotero.org/discussion/107358/ordering-non-standard-call-numbers where I hastely declared such schemas as non-standard (which is actually not true).