Polyline's show year and increment (early, late) they span when hovered over. First, last, years ending in 00s & 50s have permanently showing tooltips.
Polyline increased in weight (3 -> 5) to aid hovering.
Polyline tooltip ability only occurs in non-pooped out window of leaflet-treering.
Markers use Leaflet tooltip not browser tooltip now.
Polyline's show year and increment (early, late) they span when hovered over. First, last, years ending in 00s & 50s have permanently showing tooltips.
Polyline increased in weight (3 -> 5) to aid hovering.
Polyline tooltip ability only occurs in non-pooped out window of leaflet-treering.
Markers use Leaflet tooltip not browser tooltip now.
Closes #106