bhtree does not store snapshots at proper times

[teuben]

In $NEMO/usr/amuse bench2a, 2n and 2b compare the tree code at times 0:10;1, but despite documentation bhtree seems to overshoot a bit and returns this output:

make bench2b
### nemo Debug[0]: header
### nemo Debug[0]: x y z vx vy vz 
/usr/bin/time bhtree -i p2k.tab -o p2k.out -D 1 -T 10 -d 0.015625      >p2k.log 2>p2k.err
tail p2k.err
Call set cm, cpu = 1.49714
Call evaluate_gravity, cpu = 1.49716
nisum = 2048,  tree_walks = 0,  total_interactions = 238249,  avg = 116.333
direct_interactions = 103939 leaf_cells = 63121 direct_interactions/leaf_cells = 1.64666
Exit evaluate_gravity, cpu = 1.4989
Exit integrate, cpu = 1.49891
CPU sec = 1.49892

1.49user 0.02system 0:01.52elapsed 99%CPU (0avgtext+0avgdata 4352maxresident)k
0inputs+5016outputs (0major+295minor)pagefaults 0swaps
### nemo Debug[0]: [atos: reading 2048 bodies at time 1.066532]
### nemo Debug[0]: [atos: reading 2048 bodies at time 2.067831]
### nemo Debug[0]: [atos: reading 2048 bodies at time 3.069131]
### nemo Debug[0]: [atos: reading 2048 bodies at time 4.070430]
### nemo Debug[0]: [atos: reading 2048 bodies at time 5.071729]
### nemo Debug[0]: [atos: reading 2048 bodies at time 6.073029]
### nemo Debug[0]: [atos: reading 2048 bodies at time 7.074328]
### nemo Debug[0]: [atos: reading 2048 bodies at time 8.075628]
### nemo Debug[0]: [atos: reading 2048 bodies at time 9.076927]

this is the "same" code as in amuse, where it does work fine.