[Xastir] Tracking trails

[Byron Smith]

After watching trackers on Xastir I have noticed a few things.

1. A different color for each track. Nice.
2. If positions are not heard, Xastir draws lines from each heard posit
to the next heard. This might be OK for planes and boats, where they
probably did travel this path, but for cars and trucks its probably not
the best.
For instance, to see what the dead areas that perhaps have no coverage,
you shouldnt see any lines or trails at all. I mean, if there wasnt
anything heard, why draw a line as if it were? This helps understand
where dead spots are, and what general areas need to be covered. By
looking at the lines Xastir makes, you have to realize that there wasnt
coverage when the trail doesnt line up with known roads. Perhaps an
option to trails could be just "posit" dots or such things. At least we
can tell if we received a valid posit from an area or not.
3. I like how the cars move on the screen. Now to figure out how to make
my car be upsidedown :-)

Good job so far. I can see where Xastir is gonna kick all other versions
off computer screens. (I was being nice there hee hee)