* Prevent graphical glitches on old servers
* Fix flowing of liquids with viscosity != 1 and range != 8
* Fix range = 0, no flowing nodes will appear

old_craft_grid, craft_inv) and
minetest.register_craft_predict(itemstack, player, old_craft_grid,
craft_inv)

As agreed to by kahrl

This not only makes the vector functions faster, but also makes them more
consistent with other functions.

Add support for parameter 'visual_scale' for drawtypes 'signlike' and 'torchlike' like used for drawtype 'plantlike'

Instead of collecting all objects within a huge radius (which could be
a big value), just register each player that connects and give back the
current hold list.