Capture stdout on Windows
Currently stdout is only captured on Linux and macOS, but not Windows (https://ci.appveyor.com/project/certik/lfortran-ts83e/builds/35286674):
[NbConvertApp] Converting notebook Demo1.ipynb to notebook
Run with XEUS 0.24.1
[NbConvertApp] Executing notebook with kernel: fortran
variable i = 1
variable i = 2
variable i = 4
Bye!!
[NbConvertApp] Writing 13551 bytes to Demo1_out.ipynb
So it prints into the log, instead of being captured and displayed in the notebook itself.
This has to be fixed here: