BUG: (py2 only) fix unicode support for savetxt fmt string #13409
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By now, all that is needed is to also allow unicode strings to
pass through. Adds a test for the support which already succeeds
on python3.
Closes gh-4053 (replaces the old PR)
This is to Replace the mentioned PR gh-4053, adds a test, otherwise only relevant for python 2, so probably should backport.