Simplify slope and aspect GRASS modules

Author: pcav

src/plugins/grass/modules/r.aspect.1.png

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE qgisgrassmodule SYSTEM "http://mrcc.com/qgisgrassmodule.dtd">
+
+<qgisgrassmodule label="Create aspect raster from DEM (digital elevation model)" module="r.slope.aspect">
+	<option key="elevation" />
+	<option key="aspect" />
+</qgisgrassmodule>

src/plugins/grass/modules/r.aspect.2.png

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE qgisgrassmodule SYSTEM "http://mrcc.com/qgisgrassmodule.dtd">
+
+<qgisgrassmodule label="Create slope raster from DEM (digital elevation model)" module="r.slope.aspect">
+	<option key="elevation" />
+	<option key="slope" />
+</qgisgrassmodule>