[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Provide control over VM messages (#275)

[Damien Pollet]

Could the VM provide an option for separating its own output from the image's output?

Concretely, the VM complains about pthread_setschedparam in my Travis builds, which prevents writing command-line scripts with clean output both on stdout and stderr. See https://github.com/hpi-swa/smalltalkCI/issues/388

Maybe it's possible to play with the file descriptors at image startup, but it would make sense if the VM itself had something like a `--silent` or a `--vm-stderr FILE` flag (the JVM has `-Xlog`) to redirect its diagnostic messages so that anything that goes to stdout or stderr exclusively comes from the image.

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