v.out.ogr: fix append+overwrite mode #3283
Merged
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Currently,
v.out.ogr
deletes an existing OGR output layer in append+overwrite mode in L618ff. ThisIn are more complex workflow, overwrite might be set to the whole workflow in order to overwrite previous interim GRASS results of an unsuccessful run. Once the processing finishes successfully, overwriting any previous interim GRASS data, the final result should be appended to an external OGR output layer without deleting this external OGR output layer. If anything went wrong previously, selected records in the external OGR output layer should be deleted, but not the complete external OGR output layer.