The FIT parser will attempt to interpolate data when filling in for smart
recording or if a record is missed. A problem occurs if one of the lat/long
points is missing or 0,0.
This patch will record a 0,0 lat,long if the record is missing in the FIT
file and when interpolating, will set any interpolated data points to 0,0
if the start or end record is also 0,0.
A 0,0 record is not plotted on the MAP tab.
Fixes#111
New idea: only linearly interpolate between two consecutive "record"
messages. I don't know what else to do. My FIT files have all sorts
of weirdness I can't explain. One, for example, has two consecutive
start events with the same timestamp. What does that mean?
This is all proof that just having the file "format" isn't really
enough. What you need is the file *semantics*, and we don't have that
for FIT yet.
I'm not really sure what these are doing in the FIT file Jamie sent
to the list, but there's only one of them, and it's at the end of a
long rest period, so it seems safe to ignore it for now.
