Got rid of vestigal direction management from the original torch code.

Realized metadata is only 4 bits (one hex nibble).  I can't fit all
states into this, so I decided to only go up to supporting holes in the
downward direction.  After all, how do you plan to cram gunpowder straight
up into a hole?  So it's possible to drill a whole from underneath, but
you can't add gunpowder or clay.  Actually, the code right now is denying
downward drill at all.

Also, blocks placed face west IIRC are doing all kinds of goofy stuff.
It rotates in space when the metadata changes and all.