* Still retains use of " ^r " in the user window
* Covers special-case for FLARQ usage where ETX should
stop the modem
* EOT character can now be transmitted from Tx window instead
of switching to Rx mode
* From: Andrej Lajovic <s57ln@hamradio.si>
- Substitute symbolic names for negative return values of
get_tx_char()
* Removed extended initializer list from packet debug code
Replaced with simple array initializers
* Caused compile failure on 64 bit FC15 x86_gr with gcc 4.6.1