Don't insert WAIT leg unless the gap is > 1 second (that's the way OTP
does it).  Also fix the code so that last leg isn't dropped (it was).
[Fixes #71096588]
Add a short_description for itinerary legs that is more
descriptive. [#71095976].
Improve informaiton in tooltips (at least for transit trips for now.)
[#71095976]