Implement attributes interface to Location superclass#3

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dwillcox wants to merge 9 commits intomainfrom

Commits on Mar 30, 2021

Commits on Apr 5, 2021

Commits on Apr 16, 2021

add FileMode::exists_is_error which creates the file only if it does not exist, otherwise raises an error
dwillcox
committed
add Errors namespace and throw an error if FileMode::exists_is_error and the file was already present
dwillcox
committed

Commits on Apr 24, 2021