Doxygen file needs an update
Warning: Tag `SYMBOL_CACHE_SIZE' at line 346 of file `Doxyfile' has become obsolete.
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Warning: Tag `XML_SCHEMA' at line 1460 of file `Doxyfile' has become obsolete.
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Warning: Tag `XML_DTD' at line 1466 of file `Doxyfile' has become obsolete.
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