Nyall Dawson 559d7bb943 [rastercalc] Rework raster calculator to use QGIS raster classes ...

...rather than reading input layers directly through GDAL.
Benefits include more robust handling of nodata/data type conversions,
less code duplication, also being able to take advantage of features
in QGIS raster code like handling gain/offset in rasters. (fix #12450)

Also, add a choice of output projection to the raster calculator.
Previously the output CRS would be taken from the first raster, with
no guarantees that the output extent matched the output CRS. This
resulted in empty/misplaced rasters. (fix #3649)

2015-06-10 21:45:37 +10:00

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