[En-Nut-Discussion] NUT_OSDEBUG to stderr instead of stdout

[Thiago A. Corrêa]

Hi,

   Many applications and samples uses stdout for things other than
debug or trace. I would like to suggest that we change the code inside
Nut/OS to use fprintf(stderr) and have apps who would like to monitor
that data to assign a device to stderr instead of stdout. This way
most applications can be debugged with NUT_OSDEBUG or use the trace
functionality.

Thanks,
   Thiago A. Correa