Parameterized option to create unique subdirectory for each RoiSet, but this still isn't propagating to dataframe called in .serialize

RoiSet.run_exports and .get_export_product_accessors no longer take a channel directly, but rather pull these from parameters of individual patch products

Default assume that accessors are not lazy; add_accessor then overrides this if a lazy accessor is subsequently bound to this ID

Deleting all accessors doesn't delete those that are still registered as dependencies in unfinished tasks