SQL for place=islet
way_pixels for rendering island and islet
Merge branch 'islet_names_rendering' of https://github.com/sommerluk/openstreetmap-carto into sommerluk-islet_names_rendering

Conflicts:
	project.mml
Show zero- and near-zero-sized islands and islets on zoom 16 and 17 respectively.
Merge branch 'sommerluk-islet_names_rendering'