Proposal for dealing with IOStreams on the BB

Here is an example of how we could use the open() close() of IOStreams on the BB, as we discussed two days back. The code is implemented in config_library.jl, and an example is given in config_example.jl where the system is set up in accordance with the YAML file example_configuration.yml.

The general idea is documented in config_example.jl, and if you approve of the concept, it is easily modified to accommodate the existing modules for IO functionality (see the setup files etc.). What do you think?