List supported file types for writing RasterLayer values to disk.
When a function writes a file to disk, the file format is determined by the 'format=' argument if supplied, or else by the file extension (if the extension is known). If other cases the default format is used. The 'factory-fresh' default format is 'raster', but this can be changed using rasterOptions.
writeFormats()writeFormats returns a matrix of the file formats (the "drivers") that are supported.
Supported formats include:
| File type | Long name | default extension | Multiband support | |
| raster | 'Native' raster package format | .grd | Yes | |
| ascii | ESRI Ascii | .asc | No | |
| SAGA | SAGA GIS | .sdat | No | |
| IDRISI | IDRISI | .rst | No | |
| CDF | netCDF (requires ncdf4) | .nc | Yes | |
| GTiff | GeoTiff (requires rgdal) | .tif | Yes | |
| ENVI | ENVI .hdr Labelled | .envi | Yes | |
| EHdr | ESRI .hdr Labelled | .bil | Yes | |
| HFA | Erdas Imagine Images (.img) | .img | Yes | 
# NOT RUN {
writeFormats() 
# }
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