The option `TBT.k.File` is undocumented
TBT.k.File is currently undocumented.
The tbtrans docs do say that the "typical" siesta
kgrid_monkhorst_pack option is allowed, so one might assume the way to supply a file for tbtrans is similar to siesta/ts: By using
kgrid.File or possibly
TBT.kgrid.File. However those don't work - tbtrans needs the
TBT.k.File instead, and it works, but this little detail isn't documented.