v.distance: Linear matrix becomes default, new -s flag for square matrix [API change] #601
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This PR is commits a patch that has been in trac for years (#3638). It changes v.distances default API.
Up to now, when using the -pa flag for printing the output of a complete matrix, this matrix would default to a square matrix. This is not always the easiest form for reuse, and it also means that you cannot use -pa with more than one upload option.
This PR makes the linear matrix default for all output forms, and allows multiple upload options even with -a. A new -s allows the user to request a square matrix when only one upload option is requested.