Changed to while loop in UBX byte handling
Skip samples to reduce buffer usage
Reverted to simple flush mechanism afforded by larger audio buffer
Interpolate missing samples in PWM interrupt
Clean up Tone.c
Added Tone_FlushWhenReady back
Write whole lines to log file
Write one line at a time to log; flush/write when audio buffer is nearly full; use FS_TINY; increase audio buffer size
Removed old audio folders
Merge pull request #35 from crwper/adjust_ubx_and_tone_timing

Changed to while loop in UBX byte handling
Changed USB CDC interface to compile-time option
Merge pull request #36 from crwper/make_serial_optional

Changed USB CDC interface to compile-time option