Build 'one-dimensional-root-solver-f on 'callbacks-included
Now define one-dimensional-root-solver-f on 'callbacks-included. This needs some modification to mobject to add the 'functions slot argument and remove 'dimensions from the cbstruct when it is not in the allocation arguments. The :functions argument must be given as a list, even though there's only one function. The example (roots-one-example-no-derivative) works.
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