Edit board issues

[ipostr08]

1. Bug: removing b8 or g8 knights from the board does not update FEN
2. Suggestion: edit board size and location should be remembered after closing and restored and the initial window size should be larger
3. Suggestion: add editing of castling rights and en passant square
4. Suggestion: "full board" should be called "starting position"
5. Bug: can't edit the number of half moves and full moves directly
6. Suggestion: add a graphical indication of the side to move (like a circle of the corresponding color on the corresponding side)
7. Suggestion: add a "paste FEN from the clipboard" button
8. Suggestion: add a (non-editable) counter of the number of pieces on board

[ipostr08]

9. Bug: Removing h8 rook from the starting position doesn't remove the corresponding castling right from FEN, resulting in a position that SF and probably other engines find invalid.

[ipostr08]

10. Suggestion or a bug: after editing the board and clicking ok, players change to human vs human. And after changing a player from human to engine, the board resets to the starting position. Catch 22.