A handful of minor fixes to various things
Print playername when failing to read playerfile and ignore files starting with .
Decoration: Add support for zero probability, fix breakage from last commit
Add support for IPv6
Two new configuration options are added:
     - "enable_ipv6" to enable/disable the overall use of IPv6
     - "ipv6_server" to enable/disable the use of IPv6 sockets when running
       a server (when "enable_ipv6" is enabled)
New math mapgen with fractal based worlds
Math mapgen fix, ip show on connect, pathfinder segfault fix
Cavegen: fix division by 0 with abnormal max tunnel diameter sizes
Fix ipv6 on windows
Add LuaVoxelManip
Fix issue of VManip occasionally not blitting back blocks, and pitch black lighting bug
Add minetest.get_mapgen_object to API
Add Lua PerlinNoiseMap:get#dMap_flat API
Add Lua on_mapgen_init callback, and minetest.set_mapgen_params API
LuaVoxelManip: Separate VoxelManip data get/set from emerging/blitting data back to map
Apply various fixes to several things
Dont write player files all the time
Add voxelarea.lua helper to builtin
Make generated water a shade darker to match up with older versions
Add Lua VoxelArea methods: contains, containsp, containsi
Update documentation for get_mapgen_object