Response_dir not merged with file name correctly

When setting response_dir and running GS2 with either the full path to the input file or a relative path to a different directory the path to the response file is incorrectly constructed. We simply do response_dir//response_file when we should do the equivalent of dirname(response_file)//response_dir//basename(response_file).

This should already be handled for restart files so we probably just need to port that logic here (or better, reuse the existing code).

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