v2.7.1 hotfix rollup

Issues fixed this release:

• DnD not enabled for dynamically added playlist entries
• Reload in New Playlist track editor does not work as expected #133
• markdown help link does not work in comment edit

Miscellaneous changes and enhancements:

• extended the time window for live playlist timestamping #134
• renamed playlist editor javascript files
• improved performance of HEAD requests on js and css resources