Reduce badnwidth at low zoom level: 'trick' the map into showing lower zoom levels.
For example, if the map is at zoom level x, show the tiles for x - 4.
I don't do this exactly.
This code has a low/high zoom level switch, at
the high zoom level, behave as before this commit; at the low zoom
level, trick the map into showing very low resolution tiles, so only a
few tiles need loading to cover the map area.
Handle map tile option swtich. WIP.
Merge branch '2-level-low-res' of https://github.com/garvankeeley/MozStumbler into low-res-dev-switch
Handle the nomap case to not show any map if this option is set