Update the doc of map:create_chest().
Remove TODO from map_syntax doc (which is obsolete, by the way).
Continuing the rail temple maps.
Merge 192.168.0.44:solarus into solarus-1.0.0
Making the map editor aware of optional entity properties.
Remove useless names of teletransporters in dungeon 10.
Make the rank of enemies optional in the map file.
Fix optional properties in the editor.
Re-save zmc maps with the latest editor to remove useless content.
Fix a music file name in zsxd resource list.
Editor: still adjusting optional properties.
Revert "Re-save zmc maps with the latest editor to remove useless content."

This reverts commit d1324dab3abd55ead01a1dece9d6693497751f17.
Forgot to declare this sprite in the resource list.
Re-save maps with the latest editor to remove useless content (#112).