Non-native and :callback-toplevel-only fixes
Fixed several bugs that affected non-native implementations, where :inputs, :outputs, or both were not properly declared. According to the CFFI manual, "Portability note: defcallback will not work correctly on some Lisps if it's not a top-level form." Evidently, this includes Clozure CL, so a new symbol :callback-toplevel-only has been pushed onto *features* if openmcl. This changes examples with callbacks to define the callbacks in a separate defparameter rather than in-line when the mobject is made of the function is called. As a result of both these changes, the only errors left in CCL tests were ones seen previously. CCL 64: TOTAL: 1259 assertions passed, 3 failed, 0 execution errors. SBCL 64: TOTAL: 1257 assertions passed, 5 failed, 0 execution errors.
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