- Allow Trk,rte,alm,wpt uploads
- Better docs
- Do tests
- NMEA Protocol
- Magellan Protocol

- reformat everything (strip ending whitespace, indent everything to 2
  or 4, insert local variables information for emacs)
- change upload to upload2
- introduce new stty interface (instead of Serial.pm)
- change protocol handlers according to product id
- merge all other changes

- use garmin_protocols.tcl from gpsman as a reference for a
  complete Garmin/Handler.pm implementation