Please try r4116  with normal splitter. I hope you don't see any more
crashes in MapSource with the "Show Profile..." button
or corresponding empty "Graphs" in Basecamp, even if you hgt files contain
voids or if you use --dem-poly option.
I also did not see any problems with routing, so I hope that the description
for field at offset 0x3f in the wiki  is simply wrong.
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