<put algortithm description here>
Input layers
[multipleinput: rasters]Resolution
[selection]<put parameter description here>
Options:
Default: 0
Layer stack
[boolean]<put parameter description here>
Default: True
Allow projection difference
[boolean]<put parameter description here>
Default: False
Output layer
[raster]processing.runalg('gdalogr:buildvirtualraster', input, resolution, separate, proj_difference, output)