Always use builtin JThread library
Add configurable PRAGMA synchronous =
Fog depend on humidity
Use cached "weather" setting
Fix comments about length of server step

6b927229f5f9cb9a8163ecec482160975199fa0f Changed the default server step
from 0.05s to 0.1s
Weather: Clean up getHeat/getHumidity somewhat
Fix some warnings and other minor details
Merge pull request #1 from minetest/master

Synch with minetest:master