[haraldh]

Three fixes from the open issues.

• Multiple Garmin devices (Improve app behavior when using multiple garmin devices #15, Irritating error message if more than one Garmin device found gimporter#14): each connected device reported its own result and the last answer won, so a watch without gimporter showed "not installed" although the Edge next to it had the app. The best result of all devices is shown now.
• "Invalid course" on the Edge after saving (Invalid track on Garmin Edge #36): Locus Map writes route times relative to 1970-01-01. Since 20.1.0 parses fractional seconds, these times reached the FIT file before the FIT epoch. Such times are now moved to start at the FIT epoch, keeping the durations. Checked with the GPX from the issue: timestamps 0..11402 s.
• Waypoints all at the end in "Up Ahead" (Waypoints not exported correctly to FIT? #14): course points from GPX waypoints had no distance. They now take distance and timestamp of the nearest track point and are written in course order. Checked with the files from the issue: distances 1151/2025/3061 m instead of none.
• Found on the way: a waypoint without <type> crashed the conversion (CoursePoint.valueOf(null)).

TestCourseFit decodes the written FIT and checks distances and timestamps; 2 of its 3 tests fail without the fix. All 73 unit tests pass.

Fixes #15
Fixes #36
Fixes #14

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