DataMan + Heat Transfer: only one step is processed

Created by: pnorbert

I cannot get more than one step transferred with DataMan. Present with the old and the updated heat transfer example, commits 11e76be9 and 7973ac67

commit 11e76be9:

$ mpirun -n 1 ./bin/heatTransfer_write_adios2  ~/work/ADIOS2/examples/heatTransfer/heat_dataman.xml heatdm.bp 1 1  5 6 2 100 
[WANZmq] IP Address 127.0.0.1
[WANZmq] Port 12306
[WANZmq] Open Mode Write
Step 1:
Step 2:
Total runtime = 0.039035s

-- there are 3 steps going out...

$ mpirun -np 1 ./bin/heatTransfer_read  ~/work/ADIOS2/examples/heatTransfer/heat_dataman.xml heatdm.bp 1 1
[WANZmq] IP Address 127.0.0.1
[WANZmq] Port 12306
[WANZmq] Open Mode Read
gndx       = 5
gndy       = 6
rank 0 reads 2D slice 5 x 6 from offset (0,0)
Processing step 0

-- there is only 1 step received

$ cat data.0 
rank=0 size=5x6 offsets=0:0 step=0
 time   row   columns 0...5
                0        1        2        3        4        5
--------------------------------------------------------------
    0    0        1        1      2.7        1    -0.73        1
    0    1     -1.9     -1.9     -0.2     -1.9     -3.7     -1.9
    0    2      1.4      1.4      3.2      1.4     -0.3      1.4
    0    3      1.4      1.4      3.2      1.4     -0.3      1.4
    0    4     -1.9     -1.9     -0.2     -1.9     -3.7     -1.9

With the latest update to the example, commit 7973ac67, run the reader with an extra output filename $ mpirun -np 1 ./bin/heatTransfer_read ~/work/ADIOS2/examples/heatTransfer/heat_dataman.xml heatdm.bp outdm.bp 1 1

$ bpls -l outdm.bp -d T
  double   T     {5, 6} = -3.6591 / 3.1591 / null  / null 
    (0,0)    1 1 2.73205 1 -0.732051 1
    (1,0)    -1.92705 -1.92705 -0.195 -1.92705 -3.6591 -1.92705
    (2,0)    1.42705 1.42705 3.1591 1.42705 -0.305 1.42705
    (3,0)    1.42705 1.42705 3.1591 1.42705 -0.305 1.42705
    (4,0)    -1.92705 -1.92705 -0.195 -1.92705 -3.6591 -1.92705