Allow use all 6 faces for special tiles.
Protocol version bump.
Add missing doc for minetest.get_us_time()
Remove invalid doc about minetest.get_time_us()
Fix interlaced 3d mode second image being flipped on compiling against irrlicht >= 1.8
Fix only one texture being updated on window resize breaking sidebyside and topbottom 3d modes
Merge remote-tracking branch 'minetest/master'

Conflicts:
	doc/lua_api.txt
	src/nodedef.cpp