wip/py-whelk 2.7.1 NetBSD

We all like python for scripting, because it's so much more powerful than a shell. But sometimes we really need to call a shell command because it's so much easier than writing yet another library in python or adding a dependency:

from whelk import shell
shell.zgrep("-r", "downloads", "/var/log/httpd")
\# Here goes code to process the log

You can even pipe commands together:

from whelk import pipe
pipe(pipe.getent("group") \| pipe.grep(":1...:"))