Merge pull request #1472 from gioman/r_cost_raster

[processing] add a r.cost submodule that uses a raster input as starting point(s) + fix r.drain and add a submodule for r.drain that does not need input point vectors

python/plugins/processing/algs/grass/description/r.cost.full.raster.txt

@@ -0,0 +1,8 @@
+r.cost
+r.cost.full.raster - Creates a raster layer of cumulative cost of moving across a raster layer whose cell values represent cost.
+Raster (r.*)
+ParameterRaster|input|Unit cost layer|False
+ParameterRaster|start_rast|Name of starting raster points map|0|False
+ParameterBoolean|-k|Use the 'Knight's move'; slower, but more accurate|False
+ParameterBoolean|-n|Keep null values in output raster layer|False
+OutputRaster|output|Cumulative cost

python/plugins/processing/algs/grass/description/r.drain.coordinate.txt

@@ -0,0 +1,9 @@
+r.drain
+r.drain.coordinate - Traces a flow through an elevation model on a raster map.
+Raster (r.*)
+ParameterRaster|input|Elevation|False
+ParameterString|coordinate|Map coordinates of starting point(s) (E,N)|0,0
+ParameterBoolean|-c|Copy input cell values on output|False
+ParameterBoolean|-a|Accumulate input values along the path|False
+ParameterBoolean|-n|Count cell numbers along the path|False
+OutputRaster|output|Result

python/plugins/processing/algs/grass/description/r.drain.txt

@@ -2,7 +2,7 @@ r.drain
 r.drain - Traces a flow through an elevation model on a raster map.
 Raster (r.*)
 ParameterRaster|input|Elevation|False
-ParameterString|coordinate|Map coordinates of starting point(s) (E,N)|(0,0)
+ParameterString|coordinate|Map coordinates of starting point(s) (E,N)|0,0
 ParameterMultipleInput|vector_points|Vector layer(s) containing starting point(s)|0|False
 ParameterBoolean|-c|Copy input cell values on output|False
 ParameterBoolean|-a|Accumulate input values along the path|False