[processing] Add some missing algorithms

Author: Rado Guzinski

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

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+r.slope.aspect
+r.slope - Generates raster maps of slope from a elevation raster map.
+Raster (r.*)
+ParameterRaster|elevation|Name of elevation raster map|False
+ParameterSelection|format|Format for reporting the slope|degrees;percent
+ParameterSelection|prec|Type of output aspect and slope maps|float;double;int
+ParameterNumber|zfactor|Multiplicative factor to convert elevation units to meters|None|None|1.0
+ParameterNumber|min_slp_allowed|Minimum slope val. (in percent) for which aspect is computed|None|None|0.0
+ParameterBoolean|-a|Do not align the current region to the elevation layer|True
+OutputRaster|slope|Name for output slope raster map

python/plugins/processing/algs/otb/description/SplitImage.xml

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+<root>
+  <key>SplitImage</key>
+  <exec>otbcli_SplitImage</exec>
+  <longname>Split Image</longname>
+  <group>Image Manipulation</group>
+  <description>Rescale the image between two given values.</description>
+  <parameter>
+    <parameter_type source_parameter_type="ParameterType_InputImage">ParameterRaster</parameter_type>
+    <key>in</key>
+    <name>Input Image</name>
+    <description>Input image to be split into individual images.</description>
+    <optional>False</optional>
+  </parameter>
+  <parameter>
+    <parameter_type source_parameter_type="ParameterType_OutputImage">OutputFile</parameter_type>
+    <key>out</key>
+    <name>Output Image</name>
+    <description>The base filename of the split images.</description>
+  </parameter>
+  <parameter>
+    <parameter_type source_parameter_type="ParameterType_RAM">ParameterNumber</parameter_type>
+    <key>ram</key>
+    <name>Available RAM (Mb)</name>
+    <description>Available memory for processing (in MB)</description>
+    <minValue />
+    <maxValue />
+    <default>128</default>
+  </parameter>
+</root>