hist-server: user interruption handling

In this merge request a proper finishing of the histogram server on the application termination induced by a user.

If the histogram server execution interrupted, the zmq::error_t with error number EINTR is thrown. This error is cought in the Appliacation::Exec() and stops listening to the messages.

Edit PAL: Redmine refs #3253

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Dear @f.uhlig, @v.friese, @p.-a.loizeau,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

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Merging as working in my tests.

However is does not catch the problem of the process dying when the console is resized and the empty signal handler is suspicious
Maybe we should have a look afterward at what is described there: https://blog.esciencecenter.nl/combining-zeromq-posix-signals-b754f6f29cd6

These comments can be addressed in later MR(s)

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