Added env variable way to output to stdout and autocheck for Jupyter

[gjvnq]

Basically, icecream will now automatically output to stdout if any of the following is true:

1. The environment variable PYTHON_ICECREAM_USE_STDOUT evaluates to true.
2. The code is running from inside Jupyter.

[gruns]

thank you for this PR!

why use stdout over stderr inside jupyter?

[gjvnq]

Because stderr shows in a different background color that makes it look like an error or warning.

On Sun, 9 Jan 2022 at 00:59, Ansgar Grunseid @.***> wrote:

thank you for this PR!

why use stdout over stderr inside jupyter?

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[alexmojaki]

Related discussion: https://github.com/gruns/icecream/issues/77#issuecomment-994217945

@gjvnq Why not use the isnotebook you put there? IPython is a lot more general than Jupyter notebooks.

Another way to detect Jupyter is described here: https://github.com/gruns/icecream/issues/100#issuecomment-896250411

Apparently disabling colorama in Jupyter would be good too.

On another note, PYTHON_ICECREAM_USE_STDOUT is very wordy for a library all about convenience. IC_STDOUT seems sufficiently unique.