[m-users.] Some POSIX support for Mercury

Hi

There are just a handful of POSIX functions that are needed for creating
processes and building pipes and streams. With them, a predicate that runs a
specific program and connects to its stdin/stdout/stderr could be built. It
would also be possible to build pipes between processes and to redirect
stdin/stdout/stderr from/to files.

I think it wouldn't be hard to implement them in C (Unix and Windows) and
Java. I don't know any C#. An common Mercury abstraction of file descriptors
would be needed, that's shared between these three platforms.

The C version would just map them to the real POSIX calls (possibly with a
little more code for Windows). For Java, it can be done, too. Here's a file
descriptor class, which I've found on the web:

https://www.naukri.com/code360/library/file-descriptor-class-in-java

I've also found a project which aims at emulating POSIX in Java.
Unfortunately it's incomplete:

https://github.com/jnr/jnr-posix

And, there would also be needed a predicate which attaches a Mercury stream
to a file descriptor.

Cheers,
Volker

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