In some cases the input and output names need to be converted (for example, the input names need to be converted to python function parameter names).
With naive renaming, multiple inputs might be mapped to the same parameter name in some edge cases. The `generate_unique_name_conversion_table` creates a correct mapping.
However, in some really rare cases the resulting mapping could be confusing since it might rename an input whose name was already a correct parameter name and map a different input name to that parameter. E.g. {'AAA' -> 'aaa', 'aaa' -> 'aaa_2'}.
This PR fixes that. Names that do not change when applying the conversion_func will remain unchanged in the mapping. {'AAA' -> 'aaa_2', 'aaa' -> 'aaa'}.
Alexey Volkov