[Gpsbabel-code] bug with reverse filter and tracks

[tsteven4 <tst...@gm...>]

There is a bug with the reverse filter when applied to tracks.  It 
effects output formats kml and gpx, causing invalid xml to be produced 
due to mismatched tags.  This results because  wpt_flags.new_trkseg is 
not updated when the track is reversed.  The new_trkseg flag should be 
set at, and only at, the start of each track segment, but after reversal 
it is set only at the end of each track segment (which was the start 
before reversal).  I am thinking about a fix but I don't have anything yet.