* * Add handle to dup and dup2 posix as duplicate and duplicateTo in std/ioutils.
* Added small test & changelog entry
* Fixed import in tioutils
removed when isMainModule
* * Nest test inside block. Rename proc var -> let in captureStdout
* Renamed tmpfile to iotuils.txt
* Added block: # duplicate, duplicateTo
* Improved docstring
* Clean non-idiomatic code
* Added runnable examples
* rm 2 trailing space in expected output
* Made syntax prettier
* Runnable example: file in getTempDir()
* Tmp -> Temp
* Fixed runnableExamples on windows