Nonlinear least squares ported to callbacks-included; 'dimension-names
Nonlinear least squares now works using callbacks-included. This necessitated naming the components of dimensions individually (number-of-observations number-of-parameters). This is done with added slot 'dimension-names to the callbacks-included class and an argument of the same name to #'def-ci-subclass which defaults to '(dimensions). Because of the default, the other defmobject usage need not be changed.
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