BUG: loadtxt fails with complex data in Python 3.

The problem is that the Python complex type constructor only accepts a
pair of numbers or a string, unlike other numeric types it does not work
with byte strings. The numpy error is subtle, as loadtxt opens the file
in the default text mode, but then converts the input lines to byte
strings when they are split into separate values. The fix here is to
convert the values back to strings in the complex converter.

Closes #5655.

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