Initial 0.1 Release for Field Testing

This is the very first public release of WFDIGI for consumption by others. This firmware has survived several days of testing on my dev digi at home, but I strongly suspect that others will be able to find faults in it, so I would not recommend deploying this at remote radio sites until we get more time under its belt not misbehaving.

This is aiming to be a feature-rich stand-alone digipeater firmware that can be burned to an EPROM and installed in an unmodified AEA PK-88 TNC for APRS digipeater service.
It is not intended to be an I-gate or RF-gate, so no Internet connection or computer is required.

The clean v0.1 firmware build comes up with generic defaults and will refuse to transmit until you configure MYCALL via the serial port at 9600-8n1. The CMOS battery inside the PK-88 will preserve any edits made to the settings across power cycles, but for remote deployments it is also recommended to use a custom build of WFDIGI with the desired settings baked in as the power on defaults by editing /include/config.h and building your own image.

Installing this firmware will require a ROM burner (such as a TL866) and a blank 27C256 or equivalent PROM. If you don't happen to have these capabilities yourself, this is a good thing to ask around for at local radio clubs.