WVSTART "split"
WVPASS bup split --bench -b <t/testfile1 >tags1.tmp
WVPASS bup split -vvvv -b t/testfile2 >tags2.tmp
-WVPASS bup midx -a
+WVPASS bup margin
+WVPASS bup midx -f
+WVPASS bup margin
WVPASS bup split -t t/testfile2 >tags2t.tmp
WVPASS bup split -t t/testfile2 --fanout 3 >tags2tf.tmp
WVPASS bup split -r "$BUP_DIR" -c t/testfile2 >tags2c.tmp