Consistent apply-step, apply-evolution function names and arguments
The arguments have been changed in apply-step, apply-evolution so that they match for the first three arguments. The function name apply-step was changed so the two are similar. The macro with-ode-integration defines a local function #'next-step instead of a symbol macro 'make-next-step because symbols in the body of a simple loop violate the CL standard. Some documentation has been updated with the contribution of Mirko Vikovic.
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