fix regression: position reporting about PGN errors

add 150 example games to test PGN parser

add test directory and make target for tests

make eval_move() and check_move() not change their input string

fix fucked up indentation

add sanity check for result in PGN move text

fix that checkmate notation did not set the check flag in the move

improve implementation of read_pgn() and parse_pgn()

fix implementation of parse_pgn()

fix memory leaks in server_run() when starting the game is aborted

add parse_pgn function which can later be used for automated testing

fix checkmate detection

fix missing cleanup calls in game_play_singlemachine()

fix memory leak when simulating real threats

start fixing issue #895

(0) -100 -15 tip

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