Add i.oif algorithm

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

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+i.oif
+Calculates Optimum-Index-Factor table for spectral bands
+Imagery (i.*)
+ParameterMultipleInput|input|Name of input raster map(s)|3|False
+*ParameterBoolean|-g|Print in shell script style|False
+*ParameterBoolean|-s|Process bands serially (default: run in parallel)|False
+OutputFile|output|OIF File
+

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

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+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    i_oif.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 file2Output, verifyRasterNum
+
+
+def checkParameterValuesBeforeExecuting(alg):
+    return verifyRasterNum(alg, 'input', 4)
+
+
+def processCommand(alg):
+    # Transform output file in string parameter
+    oifFile = file2Output(alg, 'output')
+
+    alg.processCommand()
+
+    # Re-add output file
+    alg.addOutput(oifFile)