Pass line width in the correct unit

The parameter lw (start/finish line width) of the vlapi, expects as
value the line width (not radius) in km not in meters.
Make DAEC_KEYHOLE available to declarations

...so the correct waypoint type for a racing task in German competitions
can be written to devices who support it (i.e. Volklogger).
The actual handling by the Volkslogger driver will be a separate patch.
Volkslogger DAEC-Keyhole Declaration

Make the Volkslogger driver handle DAEC-Keyhole-Waypoint Types for
declarations.