High level API appears to miss frame 0 for GROMACS trajectories.
Frame 0 appears not to be being read by tng_util_read_pos
tng_util_read_pos_range
or tng_util_read_box
for GMX trajectories. This can be seen in some of the test in !21 (merged) which use explicit values from gmx dump
.
Apologies if I have missed something.