Added addOverlay, getOverlayByTitle, showProjectPopup, projectsToVectorSource, and addProjectMarkers to Mercator.js.
Added addOverlay, getOverlayByTitle, showProjectPopup, projectsToVectorSource, and addProjectMarkers to Mercator.js.

billyz313/collect-earth-online,openforis/collect-earth-online,openforis/collect-earth-online,billyz313/collect-earth-online,billyz313/collect-earth-online