r.sim.*: use G_command_history()
|Reported by:||hamish||Owned by:||helena|
rainy day task: The r.sim.* modules should be updated to use G_command_history() to save command line options into the metadata file.
AFAICT it should go in raster/simwe/simlib/output.c after the maps have been closed, but I don't use these modules myself and haven't looked at it closely.