utils.cpp:
06-20-2006	fix both write_ThirdEZD() and write_FifthEZD() functions
01-27-2005	optimize trun grid by doing multiple points at same time
01-27-2005	find surface points in groups rather than individually
	GOOD FOR: trun_exclude AND surface_area
12-01-2004	write smarter fill accessible grid function
03-02-2005	use single bit instead of 8 bit bool type
 	http://www.cs.umd.edu/class/spring2003/cmsc311/Notes/BitOp/bitI.html
