Expand troubleshooting for issues on Windows with python in git bash

[svenvanderburg]

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The part https://carpentries-incubator.github.io/python-intermediate-development/common-issues.html#python-hangs-in-git-bash can be extended with the following related problem:

Does the file remain empty when using winpty python -m pip freeze > requirements.txt? Adjust the alias to alias python='winpty -Xallow-non-tty python'

• If that in turn adds strange characters, extend it further to alias python='winpty -Xallow-non-tty -Xplain python'
• Solution source