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Fix `scatter()` to work with `nan` in meta columns (#189)

* move ' discovering applicable meta columns to own aux function

* fix scatter plot to only join relevant `meta` columns before ` dropna()`

* fix type issue (set vs. list)

* add to release notes

* add docstring

* make cols-discovery in `as_pandas()` more pythoney (as suggested by @gidden)

* change docstring for `_discover_meta_cols()`

12 of 12 new or added lines in 1 file covered. (100.0%)

1598 of 1900 relevant lines covered (84.11%)

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