Merge pull request #2890 from NaturalGIS/processing_better_grass7_r_cost

[processing] better GRASS 7 r.cost algorithms

python/plugins/processing/algs/grass7/description/r.cost.coordinates.txt

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+r.cost
+r.cost.coordinates - 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
+ParameterString|start_coordinates|Coordinates of starting point(s) (E,N)|0,0
+ParameterString|stop_coordinates|Coordinates of stopping point(s) (E,N)|
+ParameterBoolean|-k|Use the 'Knight's move'; slower, but more accurate|False
+ParameterBoolean|-n|Keep null values in output raster layer|True
+ParameterNumber|max_cost|Maximum cumulative cost|0|None|0
+ParameterNumber|null_cost|Cost assigned to null cells. By default, null cells are excluded|None|None|0
+ParameterNumber|memory|Maximum memory to be used in MB|0|None|300
+OutputRaster|output|Cumulative cost

python/plugins/processing/algs/grass7/description/r.cost.points.txt

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+r.cost
+r.cost.points - 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
+ParameterVector|start_points|Start points|0|False
+ParameterVector|stop_points|Stop points|0|True
+ParameterBoolean|-k|Use the 'Knight's move'; slower, but more accurate|False
+ParameterBoolean|-n|Keep null values in output raster layer|True
+OutputRaster|output|Cumulative cost

python/plugins/processing/algs/grass7/description/r.cost.raster.txt

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+r.cost
+r.cost.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_raster|Name of starting raster points map|False
+ParameterBoolean|-k|Use the 'Knight's move'; slower, but more accurate|False
+ParameterBoolean|-n|Keep null values in output raster layer|True
+ParameterNumber|max_cost|Maximum cumulative cost|0|None|0
+ParameterNumber|null_cost|Cost assigned to null cells. By default, null cells are excluded|None|None|0
+ParameterNumber|memory|Maximum memory to be used in MB|0|None|300
+OutputRaster|output|Cumulative cost