locations of tape boxes

col 1 = boxno (box number)
col 2 = loc (location of box)
	n = NOR-CAL (117 boxes)
	u = UC DATA (12 boxes)

to write:
# all box numbers
a_558043:558171
# 129 in all, last 12 are "u"
b_rep("n",129)
b[118:129]_rep("u",12)
d_cbind(a,b)
cat(t(d),fill=9,sep=",",file="boxloc.txt")

to read
e_scan("boxloc.txt",character(),sep=",")
f_matrix(e,ncol=2,byrow=T)