bnlcas e45c8805b3 Add axis for sum request 1244 (#1310)
* enable sum function to take an argument of dimension for a matrix fulfilling issue #1244

* added sum along a dimension to the unit test coverage for sum

* added information about sum along a dimension to the markdown

* fixed typo in error message

* made formatting chagnes for linter

* add sum to transformed functions
2018-12-09 13:09:36 +01:00
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