Add new AUTO special value, resolve #20

Jan Breuer

2015-03-18 323ec66d62f19673e66762fe25585746d3b2a5e0

 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"},
};