add ui/chessli submodule
make UI components depend on chessli submodule
only show game division in charts when actually available
fix fen castles
stop indexing PDFs
cache division better, fetch initialFen less often
don't send gone events to AI games
Merge branch 'master' of github.com:ornicar/lila

* 'master' of github.com:ornicar/lila:
  typo fixed in README.md