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* added new overall ``mapchete`` command line tool, which will replace
``mapchete_execute``, ``mapchete_serve`` and ``raster2pyramid``
* added ``mapchete create`` subcommand, which creates a dummy process
(.mapchete & .py files)
* if using an input file from command line, the configuration input_file
parameter must now be set to 'from_command_line' instead of 'cli'
* input files can now be opened directly using their identifier instead of
self.params["input_files"]["identifier"]
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