updated to take account of the new map data tile sizes
- show-more-portals no longer causes unfriendly request tile sizes. unclaimed are now visible one level further out, but l1+ is no longer available one level further in (i.e. it jumps directly from l2+ to all portals)
- slow-less-portals-when-zoomed-out - major reductions in portal visibility levels - works around the daft tile size/zoom level combinations used in the current stock intel site
