Add i.evapo.time algorithm

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

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+i.evapo.time
+Computes temporal integration of satellite ET actual (ETa) following the daily ET reference (ETo) from meteorological station(s).
+Imagery (i.*)
+ParameterMultipleInput|eta|Names of satellite ETa raster maps [mm/d or cm/d]|3|False
+ParameterMultipleInput|eta_doy|Names of satellite ETa Day of Year (DOY) raster maps [0-400] [-]|3|False
+ParameterMultipleInput|eto|Names of meteorological station ETo raster maps [0-400] [mm/d or cm/d]|3|False
+ParameterNumber|eto_doy_min|Value of DOY for ETo first day|0|366|1|False
+ParameterNumber|start_period|Value of DOY for the first day of the period studied|0|366|1|False
+ParameterNumber|end_period|Value of DOY for the last day of the period studied|0|366|1|False
+OutputRaster|output|Temporal integration