05/14/91 - JR - readping.c:
		deleted code to perform conversion of user buffer
		upon reading from ping file -- delayed till output
		(moved to scanping.c & loadping.c)
06/21/91 - JR - readping.c:
		changed direction of correction to ancil2.last_heading
		based on conf1.hd_offset from:
		   ancil2.last_heading += conf1.hd_offset 
                to:
		   ancil2.last_heading -= conf1.hd_offset
                If hd_offset is nonzero (as in case of Moana Wave) and
		you perform rotation based on last_heading, need to 
		perform correction on database and redo rotation!
01/03/94 - JR - readping.c:
		added second check for last_heading within 0-360 range
		and check for mn_heading within 0-360 range; original
		version still can yield negative heading after the
		heading offset has been applied;

