fg21sim: v0.3.0

• Major change to the Web UI.
  • The WebSocket is only used to push configurations and logging
    messages to the client;
  • The configuration manipulations and console operations are
    implemented using the AJAX techniques;
  • Modal box is used to notify the AJAX request results, therefore much
    better user experience.
• Several bug fixes to the Web UI.
• Minor improvements to the simulation parts.
• TODO/problems:
  • The console task currently still blocks the Tornado IO loop!
  • The Web UI "results" section is not implemented yet.
  • The "extragalactic/pointsources" component is not added to Web UI configurations yet.