Add new AUTO special value, resolve #20

Jan Breuer

2015-03-18 323ec66d62f19673e66762fe25585746d3b2a5e0

 libscpi/src/units.c

@@ -111,6 +111,7 @@
    {/* name */ "NAN",          /* type */ SCPI_NUM_NAN},
    {/* name */ "INFinity",     /* type */ SCPI_NUM_INF},
    {/* name */ "NINF",         /* type */ SCPI_NUM_NINF},
    {/* name */ "AUTO",         /* type */ SCPI_NUM_AUTO},
    SCPI_SPECIAL_NUMBERS_LIST_END,
};