New class mobject, new hierarchy, clean up files
Redefine 'mobject from 'gsl-object. The class 'gsl-data in data.lisp is now a subclass of it, and does not explicitly have the mpointer slot, because mobject does. Adapted #'defmobject to work with objects that have no "setter" (initialization). This expands correctly for basis-splines (no setter) and hankel (setter). The basis-splines defintions rely on the new mobjects.
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