add optional heading kwarg to getLocations in ingest
add svlabels style css for adding labels to SV instance
remove search form from base since it throws errors when 404 or 500 extend it w/o having form
add markerwithlabel.js link in test.html
split queryToImages into queryToLocs and locsToImages to reuse latter with new func pano_to_text
add markerwithlabel to overlay text in SAPano, hide when pano moves