eml2 refactor

[dmullen17]

• add_creator_id
• edit_attribute
• get_eml_attributes
• qa_eml
• qa_package
• return_eml_units
• which_in_eml

[jeanetteclark]

removed which_in_eml as this is in arcticdatautils

[jeanetteclark]

also proposing removal of return_eml_units and create_attributes_table since this functionality is now in EML

[jeanetteclark]

okay, just pushed more commits that amount to a pretty aggressive culling of this package.

I removed: add_creator_id, which_in_eml, return_eml_units, create_attributes_table and qa_eml. The functionality of all of these functions is duplicated elsewhere, with the exception of add_creator_id, but I honestly couldn't see a good use for this function given how easy references are to use in EML 2.0. Definitely going to need feedback on all of this @dmullen17

[dmullen17]

@jeanetteclark I agree with your reasoning for removing these functions. They're basically highly specific helpers that aren't all that useful or else now duplicated elsewhere.
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