Add i.group algorithm

python/plugins/processing/algs/grass7/description/i.group.txt

@@ -0,0 +1,6 @@
+i.group
+Regroup multiple mono-band rasters into a single multiband raster.
+Imagery (i.*)
+ParameterMultipleInput|input|Input rasters|3|False
+OutputRaster|group|Multiband raster
+

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

@@ -0,0 +1,32 @@
+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    i_group.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__ = '$Format:%H$'
+
+from i import verifyRasterNum
+
+
+def checkParameterValuesBeforeExecuting(alg):
+    return verifyRasterNum(alg, 'input', 2)