This eliminates the need for Linux's AX25 stack when using Direwolf or
AGWPE TNCs. It makes AGWPE the default AX.25 engine if the build does
not include Linux AX.25 support.
Direwolf >= v1.6 is recommended (< v1.2 is unsupported).
Closes#367
* Replace(..., -1) with ReplaceAll
* Variable names hiding packages
* Error messages start with lowercase and no end punctuation
* Don't `defer` in a loop
* Etc.
This new command style hopefully makes usage easier and
clearer. Usage of connect has been improved.
It is no longer possible to run http server while in
interactive mode.
