Added gaussian noise function.  Currently noise will not be added to measurements unless a user changes the initialization value and builds from source.

Added setter functions for HIL noise variances.  Researching methods to add zero mean gaussian random number before implementation

Also:
- Prompts to reset trims to zero prior to calibrate
- Turned of radio check for now since it prevents spectrum bind

- Download working again
- Fixed lots of bad error handling

writeFileAccumulator contents cleared on errors, nack or ack timeout
memcpy used to transfer data to request message buffer