[Processing]Add v.what.rast algorithms

* Implements Redmine feature request #6859.
* v.what.rast.points when type=point. For points input layers.
* v.what.rast.centroids when type=centroid. For polygons input layers.

Author: Médéric RIBREUX

python/plugins/processing/algs/grass7/description/v.what.rast.centroids.txt

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+v.what.rast
+v.what.rast.centroids - Uploads raster values at positions of vector centroids to the table.
+Vector (v.*)
+ParameterVector|map|Name of vector points map for which to edit attributes|2|False
+ParameterRaster|raster|Raster map to be sampled|False
+ParameterTableField|column|Name of attribute column to be updated with the query result|map|0|False
+ParameterString|where|WHERE conditions of SQL statement without 'where' keyword|None|True
+Hardcoded|type=centroid
+*ParameterBoolean|-i|Interpolate values from the nearest four cells|False|True
+OutputVector|output|Sampled

python/plugins/processing/algs/grass7/description/v.what.rast.points.txt

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+v.what.rast
+v.what.rast.points - Uploads raster values at positions of vector points to the table.
+Vector (v.*)
+ParameterVector|map|Name of vector points map for which to edit attributes|0|False
+ParameterRaster|raster|Raster map to be sampled|False
+ParameterTableField|column|Name of attribute column to be updated with the query result|map|0|False
+ParameterString|where|WHERE conditions of SQL statement without 'where' keyword|None|True
+Hardcoded|type=point
+*ParameterBoolean|-i|Interpolate values from the nearest four cells|False|True
+OutputVector|output|Sampled

python/plugins/processing/algs/grass7/ext/v_what_rast.py

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+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    v_what_rast.py
+    ---------------------
+    Date                 : January 2016
+    Copyright            : (C) 2016 by Médéric Ribreux
+    Email                : medspx at medspx dot fr
+***************************************************************************
+*                                                                         *
+*   This program is free software; you can redistribute it and/or modify  *
+*   it under the terms of the GNU General Public License as published by  *
+*   the Free Software Foundation; either version 2 of the License, or     *
+*   (at your option) any later version.                                   *
+*                                                                         *
+***************************************************************************
+
+This Python module handles output for v.what.rast.* GRASS7 modules.
+"""
+
+__author__ = 'Médéric Ribreux'
+__date__ = 'January 2016'
+__copyright__ = '(C) 2016, Médéric Ribreux'
+
+# This will get replaced with a git SHA1 when you do a git archive
+
+__revision__ = '$Format:%H$'
+
+import os
+
+
+def removeOutput(alg):
+    """Remove the output fo v.what.rast"""
+    # We temporary remove the output 'sequence'
+    output = alg.getOutputFromName(u'output')
+    alg.removeOutputFromName(u'output')
+
+    # Launch the algorithm
+    alg.processCommand()
+
+    # We re-add the previous output
+    alg.addOutput(output)
+
+
+def outputInput(alg):
+    """Make output the initial point/polygon layer"""
+    output = alg.getOutputValue(u'output')
+    command = u"v.out.ogr -c type=auto -s -e input={} output=\"{}\" format=ESRI_Shapefile output_layer={}".format(
+        alg.exportedLayers[alg.getParameterValue(u'map')],
+        os.path.dirname(output),
+        os.path.basename(output)[:-4]
+    )
+    alg.commands.append(command)
+    alg.outputCommands.append(command)

python/plugins/processing/algs/grass7/ext/v_what_rast_centroids.py

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+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    v_what_rast_centroids.py
+    ------------------------
+    Date                 : January 2016
+    Copyright            : (C) 2016 by Médéric Ribreux
+    Email                : medspx at medspx dot fr
+***************************************************************************
+*                                                                         *
+*   This program is free software; you can redistribute it and/or modify  *
+*   it under the terms of the GNU General Public License as published by  *
+*   the Free Software Foundation; either version 2 of the License, or     *
+*   (at your option) any later version.                                   *
+*                                                                         *
+***************************************************************************
+"""
+
+__author__ = 'Médéric Ribreux'
+__date__ = 'January 2016'
+__copyright__ = '(C) 2016, Médéric Ribreux'
+
+# This will get replaced with a git SHA1 when you do a git archive
+
+__revision__ = '$Format:%H$'
+
+from v_what_rast import removeOutput, outputInput
+
+
+def processCommand(alg):
+    removeOutput(alg)
+
+
+def processOutputs(alg):
+    outputInput(alg)

python/plugins/processing/algs/grass7/ext/v_what_rast_points.py

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+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    v_what_rast_points.py
+    ---------------------
+    Date                 : January 2016
+    Copyright            : (C) 2016 by Médéric Ribreux
+    Email                : medspx at medspx dot fr
+***************************************************************************
+*                                                                         *
+*   This program is free software; you can redistribute it and/or modify  *
+*   it under the terms of the GNU General Public License as published by  *
+*   the Free Software Foundation; either version 2 of the License, or     *
+*   (at your option) any later version.                                   *
+*                                                                         *
+***************************************************************************
+"""
+
+__author__ = 'Médéric Ribreux'
+__date__ = 'January 2016'
+__copyright__ = '(C) 2016, Médéric Ribreux'
+
+# This will get replaced with a git SHA1 when you do a git archive
+
+__revision__ = '$Format:%H$'
+
+from v_what_rast import removeOutput, outputInput
+
+
+def processCommand(alg):
+    removeOutput(alg)
+
+
+def processOutputs(alg):
+    outputInput(alg)