o GRASS text mode startup

  "grass76" starts up g.gui by default (if not first time user).
  "grass76 --text" will start up in text mode.
  "grass76 --gtext" will start up with graphical welcome screen but continue then in text mode.
  "grass76 --gui" will start up in th graphical user interface (wxpython mode).

  You can set an alias "grass76" to e.g. "grass76 --text" to use text mode by default.
  Or set the environmental variable GRASS_GUI=text.


o GRASS non-interactive startup examples

  You can startup GRASS non-interactively using some env variables.

  	LOCATION
	GISDBASE
	LOCATION_NAME
	MAPSET

  LOCATION var overrides GISDBASE/LOCATION_NAME/MAPSET location.

  ex1)
  	export LOCATION=/usr/home/grass/usr/data1/loc1/map1
	export GISDBASE=/usr/home/grass/usr/data1
	export LOCATION_NAME=loc1
	export MAPSET=map1

	grass76 -	# non-interactive startup using LOCATION location

  ex2)
	export GISDBASE=/usr/home/grass/usr/data1
	export LOCATION_NAME=loc1
	export MAPSET=map1
  	
	grass76 -	# non-interactive startup using
			# GISDBASE/LOCATION_NAME/MAPSET location


  Also, the first argument of grass76 can override these env vars.

  ex3)
  	export LOCATION=/usr/home/grass/usr/data1/loc1/map1
	export GISDBASE=/usr/home/grass/usr/data1
	export LOCATION_NAME=loc1
	export MAPSET=map1

	grass76 /usr/home/grass/usr/data2/loc2-1/map1-1
			# non-interactive startup using
			# /usr/home/grass/usr/data2/loc2-1/map1-1 location

  ex4)
	export GISDBASE=/usr/home/grass/usr/data1
	export LOCATION_NAME=loc1
	export MAPSET=map1
  	
	grass76 /usr/home/grass/usr/data2/loc2-1/map1-1
			# non-interactive startup using
			# /usr/home/grass/usr/data2/loc2-1/map1-1 location

  ex5)
  	export LOCATION=/usr/home/grass/usr/data1/loc1/map1
	export GISDBASE=/usr/home/grass/usr/data1
	export LOCATION_NAME=loc1
	export MAPSET=map1

	grass76 map1-1	# non-interactive startup using
			# GISDBASE/LOCATION_NAME/map1-1 location

  ex6)
  	export LOCATION=/usr/home/grass/usr/data1/loc1/map1
	export GISDBASE=/usr/home/grass/usr/data1
	export LOCATION_NAME=loc1
	export MAPSET=map1

	grass76 loc2-1/map1-1
			# non-interactive startup using
			# GISDBASE/loc2-1/map1-1 location


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