- XON/XOFF were boycotted, but they are useful -- we needed <DC1>/<DC3>
- The <DCx> codes in ASCII are meant for device-level interaction
- Moved them away, so device drivers can use these codes
- This is a serial-friendly modification to the 8-bit clean requirement
- Applications now have to escape the <DCx> codes as though mulTTY used them
- <STX> goto child, <ETX> goto parent, <SUB> goto peer, <EOT> terminate
- Escape definitions/routines are updated accordingly

Note:
 - The service name in the diasasl-api-server is "diasasl-demo"
 - Set this by invoking "saltty -s diasasl-demo ..."
 - Will take a note in the Quick-SASL project to fix this