Add test for command tree traversal

Jan Breuer

2015-04-19 4758bdc8a35c3604f8b6dd72b3d49e7bc5ff9b1e

 examples/common/scpi-def.cpp

@@ -172,5 +172,6 @@
    /* units */ scpi_units_def,
    /* special_numbers */ scpi_special_numbers_def,
    /* user_context */ NULL,
    /* idn */ {"MANUFACTURE", "INSTR2013", NULL, "01-02"},
};