Resolve "Operation to SFG Conversion"

Added to_sfg method, MAD operation and some tests.

Closes #80 (closed)

b_asic/operation.py

@@ -375,23 +375,20 @@ class AbstractOperation(Operation, AbstractGraphComponent):
         inputs = [Input() for i in range(self.input_count)]
 
         try:
-            out_operations = self.evaluate(*inputs)
+            output_operations = self.evaluate(*inputs)
+            if isinstance(output_operations, Operation):
+                output_operations = [output_operations]
+            outputs = [Output(o) for o in output_operations]
         except TypeError:
             operation_copy = self.copy_component()
             inputs = []
             outputs = []
             for i in range(self.input_count):
-                _inp = Input()
-                operation_copy.input(i).connect(_inp)
-                inputs.append(_inp)
+                _input = Input()
+                operation_copy.input(i).connect(_input)
+                inputs.append(_input)
 
             outputs = [Output(operation_copy)]
-            return SFG(inputs=inputs, outputs=outputs)
-
-        if isinstance(out_operations, Operation):
-            out_operations = [out_operations]
-
-        outputs = [Output(o) for o in out_operations]
 
         return SFG(inputs=inputs, outputs=outputs)