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Introduce GRASS_USE_REXTERNAL setting
GRASS GIS, in addition to importing data in its native formats via `r.in.gdal`/`v.in.ogr` (and likewise `r.import`/v.import`), also supports `r.external`/`v.external` which only link the data into the GRASS DB. Nevertheless, both `r.external` and `v.external` occasionally have problems, especially on windows. E.g.: - https://trac.osgeo.org/grass/ticket/3927 GRASS 7 Processing Plugin already has a setting that controls whether `v.external` is used (disabled by default). With this commit the complementary setting for `r.external` gets added too. Usage of `r.external` is disabled by default. This is changing the existing behavior, which was to use r`r.external`. The downsides of this change should be the somewhat lower import speed + higher disk usage. Nevertheless this way we have the same default value as `v.external` + we circumvent the `r.import/v.import` shortcomings.
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