Add verbosity levels in debug module. Allow logging to console or file
based on compile time flag.  Update debug print calls in each module.

 Changes to be committed:
	modified:   main/debug.c
        modified:   main/debug.h
	modified:   main/main.c
	modified:   main/makefile
	modified:   main/pwm.c
	modified:   main/pwm.h
	modified:   main/timer.c