Black error message in dark mode (e.g. VSCode) not easily readable

[emcastro]

Use of ANSI control characters is annoying when using VSCode Jupyter in standard dark mode. Some error messages are written black on dark gray.

Try to read the message | null.toString()!

[andrus]

We'll track it under #24

[emcastro]

We'll track it under #24

They are different problems. The issue with VSCode is just inadequate use of BOLD_BLACK_FG color, which is black regardless of the theme of the terminal, instead of BOLD_REST_FG which is black in Jupyter Lab and white in dark TTY (including VSCode).

The solution was easy (cf. merge request #58). I use it at home. it works well with VSCode and Jupyter Lab.

For #24, the problem is to determine the standard way to detect that ANSI colors should not be used.

[andrus]

Ok, looks I was a bit too rush to combine the two issues. Reopening.

[andrus]

Merged #58. Thanks!