updated srv test to now be able to use save game and fetch the saved games
added game flags whether the game has been saved and whether the ending of the game is the result of a checkmate
updated saved_games table, no longer keeping game in games table if it is saved; added method for removing a game; modified insert and select methods as per the new table layout
added checkmate field to results table; modified Database implementation and usage as per the addition of the new field
added action for deleting a saved game