Make it clear that fields is not an option for writing in unicsv.

[robertlipe]

• Disallow 'fields' option when writing unicsv.

[codacy-production[bot]]

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Coverage variation	Diff coverage
:white_check_mark: +0.01%	:white_check_mark: ∅

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (5a08554b7b57802ed6f7870df6bb0ddc43c97e8f) | 27532 | 17243 | 62.63% | | | Head commit (c55a154b585796b67d54efe9bdce09f92952f1a9) | 55073 (+27541) | 34495 (+17252) | 62.64% (**+0.01%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#1319) | 0 | 0 | **∅ (not applicable)** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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[tsteven4]

The ideas I mentioned in a comment illustrated here (implicit conversion of positions between degrees and radians): https://github.com/GPSBabel/gpsbabel/compare/master...tsteven4:gpsbabel:implicitdegrad

The second usage in smplroute is a bit rough, that should clean up when linepart returns a PositionDeg.

[tsteven4]

demo enhanced with linepart returning PositionDeg.

[robertlipe]

These changes have all landed in other PRs. Closing and nuking this fork.