Makefile fixed due to linking problems

Signed-off-by: Benjamin Vahl <benjamin.vahl@googlemail.com>
Merge branch 'master' of https://github.com/ikstream/Brick_Atenuator
implemented logfile that logs attenuation changes with a timestamp

Signed-off-by: Benjamin Vahl <benjamin.vahl@googlemail.com>
Merge branch 'next-bvahl'
- -l <logfile> option for logging attenuation changes works
- fixed some printf format warnings

Conflicts:
	control.c
	input.c
	input.h

Signed-off-by: Benjamin Vahl <benjamin.vahl@googlemail.com>