Add i.evapo.mh algorithm

python/plugins/processing/algs/grass7/description/i.evapo.mh.txt

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+i.evapo.mh
+Computes evapotranspiration calculation modified or original Hargreaves formulation, 2001.
+Imagery (i.*)
+ParameterRaster|netradiation_diurnal|Name of input diurnal net radiation raster map [W/m2/d]|False
+ParameterRaster|average_temperature|Name of input average air temperature raster map [C]|False
+ParameterRaster|minimum_temperature|Name of input minimum air temperature raster map [C]|False
+ParameterRaster|maximum_temperature|Name of input maximum air temperature raster map [C]|False
+ParameterRaster|precipitation|Name of precipitation raster map [mm/month]|True
+*ParameterBoolean|-z|Set negative ETa to zero|False
+*ParameterBoolean|-h|Use original Hargreaves (1985)|False
+*ParameterBoolean|-s|Use Hargreaves-Samani (1985)|False
+OutputRaster|output|Evapotranspiration