collection.js: add 'remove' method
fix-table.js: add 'removeRow' method
flight.js: add sfid attributes to ol features
OpenLayers: fix removal of ProgressiveLineStrings

See https://github.com/TobiasLohner/openlayers/commit/5b08c4814b5821d69ce8beefa97df222d4f40dac
flight.js: add 'removeFlight' method
fix-table.js: add flight removal icon