Add i.maxlik algorithm

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

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+i.maxlik
+Classifies the cell spectral reflectances in imagery data.
+Imagery (i.*)
+ParameterMultipleInput|input|Input rasters|3|False
+ParameterFile|signaturefile|Name of input file containing signatures|False|False
+OutputRaster|output|Classification
+OutputRaster|reject|Reject Threshold

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

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+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    i_maxlik.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 regroupRasters, file2Output
+
+
+def processCommand(alg):
+    # Regroup rasters
+    regroupRasters(alg, 'input', 'group', 'subgroup', {'signaturefile': 'sig'})