fpr_photo_qa_df to find duplicate photo names and produce data frame showing missing photos and sites with duplicates

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related to #46 because will now look for exact keyword matches within overall photo name string in format _keyword.

This waws closed when function first created

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• modify the function so that it can look for photos in any location vs just 'data/photos'

• solution involves nesting fpr_photo_qa_prep within fpr_photo_qa which should be fine

• Although this was closed here when this change was made we see some strange behaviour in that thefpr_photo_qa function now modified to take any file path is working without having one of the params provided (dat = pscis_all). It seems that because we are feeding it an unnamed dataframe (it actually is pscis_all but it is unnamed) within fpr_photo_qa_df it works. Seems weird, but maybe makes sense.... Could rear its head somewhere.....

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move to fs package so we don't need to include the trailing slash in dir_photos param. This means all the helper functions need the update since that is what it is passed to...