#9 Incoherence call parameters

[Pascal Verdier]

In C++ API the get_logging_target and the add_logging_target methods are not coherent.

the add_logging_target method takes 2 input parameters (e.g. file and /tmp/log_data)
and get_logging_target method returns one string (e.g. file::/tmp/log_data)

[Nicolas Leclercq]

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Done. Modified API logging function (now support the
target_type::target_name syntax).