refactor(get_iv; get_all_ivs ): make parameter code handling more general for ivs#10

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ntdosch wants to merge 1 commit intoaleaf:developfrom

ntdosch:get_iv_update

Commits on Mar 31, 2022

updates to get_iv and get_all_ivs to more generally handle parameter codes and pull parameter code descriptions from nwis
ntdosch
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