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Improve file handling

Emilio Meschi requested to merge improve_file_handling into master

This refers to #32 addressing the following:

  1. Argument passing to constructors and functions was rationalised: config and control are passed and stored as references so it should be almost for free to get config and control information directly querying instead of copying stuff.
  2. There should be a single class dealing with directories and files: An OutputFileHandler class was introduced that deals with output file life cycle. This should be used by both types of filters but for now only OutputByOrbit has been ported
  3. The file close and rename should be made asynchronous and non-blocking, it should be moved to the class dealing with files: This is now handled through a synchronous bounded queue and dealt with in a separate thread. The size of the bounded queue is for the moment a fixed number (10) - need a strategy that takes into account the size of the files.

The code was tested in the b40 setup

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