+test_prog: Test program for model tools. (test_prog)
+|--game: Gaming group (test_prog/game)
+| `--\e[1mgame\e[m: A game abstraction for RPG. (test_prog/game/game.nit)
+|--platform: Fictive Crappy Platform. (test_prog/platform)
+| `--\e[1mplatform\e[m: Declares base types allowed on the platform. (test_prog/platform/platform.nit)
+|--rpg: Role Playing Game group (test_prog/rpg)
+| |--\e[1mcareers\e[m: Careers of the game. (test_prog/rpg/careers.nit)
+| |--\e[1mcharacter\e[m: Characters are playable entity in the world. (test_prog/rpg/character.nit)
+| |--\e[1mcombat\e[m: COmbat interactions between characters. (test_prog/rpg/combat.nit)
+| |--\e[1mraces\e[m: Races of the game. (test_prog/rpg/races.nit)
+| `--\e[1mrpg\e[m: A worlg RPG abstraction. (test_prog/rpg/rpg.nit)
+`--\e[1mtest_prog\e[m: A test program with a fake model to check model tools. (test_prog/test_prog.nit)