show pgn variations
the pgn dumper can use a sole move
decouple replay generation from UCI dump
empty pgn = empty UCI dump
fix package
fix UCI move creation when promoting
Merge commit 'e6845'

* commit 'e6845':
  fix UCI move creation when promoting
  fix package
  empty pgn = empty UCI dump
  decouple replay generation from UCI dump
  the pgn dumper can use a sole move
  show pgn variations