Prevent a buffer overflow when the minute is too long.
On DSTERR (bit 17 == bit 18), do not make the string red but the bits themselves (and green if OK).
Move displaying of IO errors from get_bit() to display_bit_gui()
Remove leftover wattron/wattroff pair.
Bits are only OK if their state is below GETBIT_READ, so only display "OK" in those cases.