Several bugfixes for HDF5 merger
This fixes a few bugs we (@dguest, @jburr) noticed in grid jobs:
- Most importantly: the memory offset wasn't being set correctly when files were merged, which lead to a segfault.
- Two parser options were defined with the flag
-b
, now one of them is-B
- We now print a warning and skip scalar datasets, since the optimal way of merging these isn't clear.