Command : SNR  (Search aNd Replace strings)

Description: 	This command will replace all occurances of 
		a string in the name of points, plines and sets
		This command will also replace text strings for 
		text objects.  
		Example:TEXT = hello world
			Search = world
			Replace= john
			new text = hello john
		Limitation: This command does not see EAT codes
		as special text.  For example:
			TEXT = Elev \SUB{Z,2} 
			Search = S
			Replace= xx
			new text = Elev \xxUB{Z,2}
			(this is no longer a valid EAT code)

