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- allow a geopoints column name to be used as index when assigning data to a column
- allow -, + and abs operators to work on Metview classes (e.g. a = -my_fieldset)
- added support for Metview's file object
- fixed issue where negative indexing did not work on a Fieldset
- fixed issue where concurrent iterators on a Fieldset did not work
- added experimental support for pickling Fieldsets
- automatically obtain list of Macro-based functions
- allow all example notebooks to run in Binder
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