Add all possible units from IEEE488.2 to address some points of #26

Jan Breuer

2016-02-22 e7d3092dd149ce455eaa934cc63104b6273302f5

 libscpi/test/test_fifo.c

@@ -25,10 +25,9 @@

static void testFifo() {
    scpi_fifo_t fifo;
    fifo_init(&fifo);
    int16_t fifo_data[4];
    fifo_init(&fifo, fifo_data, 4);
    int16_t value;

    fifo.size = 5;

#define TEST_FIFO_COUNT(n)                      \
    do {                                        \