Add v.to.3d algorithm

python/plugins/processing/algs/grass7/description/v.to.3d.txt

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+v.to.3d
+Performs transformation of 2D vector features to 3D.
+Vector (v.*)
+ParameterVector|input|Name of input vector map|-1|False
+ParameterString|height|Fixed height for 3D vector features (float)|None|False|True
+ParameterTableField|column|Name of attribute column used for height|input|0|True
+OutputVector|output|3D

python/plugins/processing/algs/grass7/ext/v_to_3d.py

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+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    v_to_3d.py
+    ----------
+    Date                 : March 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__ = 'March 2016'
+__copyright__ = '(C) 2016, Médéric Ribreux'
+
+# This will get replaced with a git SHA1 when you do a git archive
+
+__revision__ = '$Format:%H$'
+
+
+def checkParameterValuesBeforeExecuting(alg):
+    """ Verify if we have the right parameters """
+    height = alg.getParameterValue('height')
+    column = alg.getParameterValue('column')
+    if (height and column) or (not height and not column):
+        return alg.tr("You need to set either a fixed height value or the height column!")
+
+    return None