Detected unfreed memory blocks after a round-based game:

* images and other loaded in 'init_start'

* images and other loaded in 'init_2d'

* stuff related to levels list (load_level_list, add_level_entry)

* some images from load_tank (3072 bytes in ImageOpen)
    and maybe (my profiler is not precise for that) some
    OpenGL allocated stuff (such as glLists...) (_many_ small entries)
    or Glass problems (I dont profile glass library, so I cant know
    if troubles comes from it)

* NULL pointers are manipulated, in glass or opengl

* unfreed stuff from load_munition and load_munition_actions (many)

* unfreed stuff from add_player (16 bytes each time)

* unfreed stuff from draw_player_config (12 bytes)

* unfreed stuff from start_game (each time 12 bytes)

