overhaul of the max-links plugin
- rather than drawing each triangle completely, draw each edge just once. prevents overdraw
- use dashed lines for edges - allows existing links to be seen
- change to calculate on lat/lng directly, rather than the odd offset-to-positive latE6/lngE6 used before
- change the event used for detecting portals added to map - was using one fired before portals added to the map before