For GeneSymbolThesarus, if several.ok, a named list
where each entry is the current symbol found for each symbol provided and the
names are the provided symbols. Otherwise, a named vector with the same information.
For UpdateSymbolList, symbols with updated symbols from
HGNC's gene names database
Details
For each symbol passed, we query the HGNC gene names database for
current symbols that have the provided symbol as either an alias
(alias_symbol) or old (prev_symbol) symbol. All other queries
are not supported.