<put algortithm description here>
Grids
[multipleinput: rasters]Arithmetic Mean
[raster]Minimum
[raster]Maximum
[raster]Variance
[raster]Standard Deviation
[raster]Mean less Standard Deviation
[raster]Mean plus Standard Deviation
[raster]processing.runalg('saga:statisticsforgrids', grids, mean, min, max, var, stddev, stddevlo, stddevhi)