Add r.transect algorithm (doesn't work because of a GRASS7 (reported) bug)

Author: Médéric RIBREUX

python/plugins/processing/algs/grass7/description/r.transect.txt

@@ -0,0 +1,9 @@
+r.transect
+Outputs raster map layer values lying along user defined transect line(s).
+Raster (r.*)
+ParameterRaster|map|Raster map to be queried|False
+ParameterString|line|Transect definition: east,north,azimuth,distance[,east,north,azimuth,distance,...]|None|False|False
+ParameterString|null_value|String representing NULL value|*|False|True
+*ParameterBoolean|-g|Output easting and northing in first two columns of four column output|False
+OutputFile|output|Transect file
+