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add string flip() method and function and enable 13 spectests
7 new passing test files
anoter passing test file
Remove test which only passed by accident.
three more passing test files
7 more passing spectest files
more passing test files
Remove another file that only passed by accident
Remove test which never should have worked
run 4 more spectest files
Merge remote branch 'moritz/more-spectests'
Tiny whitespace fix
run 34 more spectest files
Switch to data-driven spectest driver (moritz)