This isn't true, especially for dbgbmap.py, 100% is very possible in
filesystems with small files. But by limiting padding to 99.9%, we avoid
the annoying wasted space caused by the rare but occasional 100.0%.
No one is realistically ever going to use this.
Ascii art is just too low resolution, trying to pad anything just wastes
terminal space. So we might as well not support --padding and save on
the additional corner cases.
Worst case, in the future we can always find this commit and revert
things.
This matches dbgbmap.py and fits in with the other dbg scripts.
The choice of tracebd.py for the name was arbitrary anyways, we just
needed something that wouldn't conflict with other scripts.