Add r.series.accumulate algorithm (needs a way to select a raster in the input rasters)

Author: Médéric RIBREUX

python/plugins/processing/algs/grass7/description/r.series.accumulate.txt

@@ -0,0 +1,12 @@
+r.series.accumulate
+Makes each output cell value an accumulation function of the values assigned to the corresponding cells in the input raster map layers.
+Raster (r.*)
+ParameterMultipleInput|input|Input raster layer(s)|3.0|False
+ParameterSelection|method|This method will be applied to compute the accumulative values from the input maps|gdd;bedd;huglin;mean|0
+ParameterNumber|scale|Scale factor for input|0.0|None|1.0|True
+ParameterNumber|shift|Shift factor for input|0.0|None|0.0|True
+ParameterString|range|Ignore values outside this range (min,max)|-10000000000,10000000000|False|True
+ParameterString|limits|Lower and upper accumulation limits (lower,upper)|10,30|False|True
+ParameterBoolean|-n|Propagate NULLs|False
+*ParameterBoolean|-f|Create a FCELL map (floating point single precision) as output|False
+OutputRaster|output|Accumulated